Engine trouble, any thoughts?

Hi everyone! This is my first tech thread so please forgive me for any blunders. My car is a U.S. 1995 355 Berlinetta, six-speed, 27,500 miles, all stock including Ferrari headers, with the only aftermarket parts being Hyper-Flows and a Capristo Stg 3. The Ferrari headers were said to be fine by my mechanic at the time of PPI 3 months and 2700 miles ago. Leakdown was said to be acceptable with only cylinders 2, 3, and 5 reading leakdown at 4%, 2% and 5% respectively. Compression was #1 175, #2 165, #3 175, #4 180, #5 172, #6 185, #7 175, #8 185. I was told these were acceptable numbers, but since purchasing I remember reading a thread here that spoke of the #2 cylinder usually being the first to go because of header failure. Oh, and the last major was done at 17,000 mi. in 2004.
Now, on to the problem. Today I was driving the car and after about 10 minutes I think a bank of cylinders shut down (I should have felt the tailpipes for exhaust flow but wasn't thinking in my terrified state). No CEL's or Slowdown lights came on, and they are present and functioning (illuminate at start-up). What happened is I shifted into neutral from 4th gear while travelling about 45 mph and coasted for about 50 feet, then shifted into 3rd.
Upon applying the throttle the car had a large power loss, as well as a change in sound and vibration feel. The car wasn't as loud, the revolutions sounded kinda warbly but steady, almost underwater if that makes any sense. I turned around and drove it back to my garage, and on the way it went back to normal. I revved it up a couple times to about 6500rpm, and all was well. No glowing cats, no excessive fuel smell. Parked it, and decided to try disconnecting the battery. I did so, but I mistakenly left the fog-lights on when restarting/relearning while letting it idle. The car idled fine for about 3 minutes, then the problem recurred. I let it idle like this for another minute or so, then shut it down. The car sat for about an hour, and after looking around on F-chat and the manual I found out all electrical draws need to be off during relearning. I tried the reset/relearn again, and after idling beautifully for ten minutes, I drove the car around for about 45 minutes, with absolutely no problems at all.
And at long last, my question. If the car continues to run perfectly, should I continue to drive it until the problem returns, or should I get the car serviced? I'm far from being a mechanic, and what you guys might consider a simple fix or check is probably a major headache for a guy like me. I was planning on doing the 30K service in about 3-4 months, along with headers and possibly valve guides. My options are: #1 do 30K as soon as possible. #2 continue to run it until problem arises again. #3 have a mechanic pull the codes and look at the car for me. My obvious fear is that I'll be driving along and suddenly find myself in the middle of a 30K engine rebuild. All help and suggestions will be greatly appreciated.

Thanks everyone for all the great stuff f-chat brings to us, I can only hope someday I can contribute as much as others have.

P.S. some pics of the car in question

P.P.S. sorry all the paragraphs ran together, it looked okay when I was typing, but after posting it got all jumbled.
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Thanks No Doubt and mseals. The CEL's and Slow Down lights are present and illuminate with the other lights when the key is in the "on" position, however they have never illuminated while driving the car. Is the process for pulling codes on my 355 the same as what is on your 348primer site, or do I need a special reader of some sort?

 

you guys are awesome. I drove the car this morning for about an hour, running it pretty hard as well as going easy on it. No return of the problem, but I know this doesn't mean there is nothing wrong with the car. I will pull the codes tomorrow, and post what I get. Thanks for everyone's help, and thanks for the nice comments on the pictures.