360 spider says roof not up or down, so can't put it in gear

It's probably a microswitch that needs adjustment. They're very simple devices that typically last the life of the car. There's quite a few of them though and they are tricky to find. @Qavion has a wonderful electrical diagram of the capote system. If you search his postings, you'll find it or maybe he'll chime in here with a link. I suggest getting an OBD scanning device that can read the switches in the capote. A free one that's an Android app (EOBD Facile) connects with a $15 dongle on Amazon and allows you real time data on the switches. The OBD trouble codes for the capote should steer you in the right direction and with the electrical diagram, should make it possible to solve this issue.

As a side note, something caused that microswitch to stop reporting correctly. Did you recently have an incident with the capote? Perhaps a failure closing it or anything? The capote mechanism is something that should never be pushed, prodded or forced. If it doesn't close perfectly on its own, then it needs to be fixed.

The good news about the capote is that it's very DIY friendly. If you put your mind to fixing the thing, know that it can be fixed by mere mortals.

 

You will need a scan tool to see which switch is giving the wrong signal..not open or closed at the correct time..

 

The workshop manual says that with the engine running and the car at rest, if the engine lid is opened without pressing the brake pedal, the gear is automatically disengaged and shifted to neutral. There is also an input into the Roof ECU from the engine lid switches. An open engine lid will prevent the roof opening.

However...
1) will an open engine lid put on the roof warning light?
2) I can't find an input into the F1 TCU from the engine lid switch in the wiring diagrams. There is an input from the lid switch to the instruments (for the lid open warning) and to the Roof ECU and to the Immobiliser ECU. Perhaps this "lid open" data is sent on CAN Busses?

Anyway, I would also expect an engine lid open warning on the instrument displays if that was a cause, so I'm really quite baffled (if you're not also getting this).

For info, if the lid is open, this puts an earth on a wire going to the Roof ECU upper plug (pin 5). If the wire colours are visible, this will be a blue/grey wire.

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If you're not getting an engine lid open warning, then I don't understand why the roof should interfere with gear selection.

 

If the engine lid warning light is not coming on, it may just be coincidence. If the car is currently changing gears correctly, perhaps you could start the car, open the roof a little and see if you can change gears (car below 5kph). That way you prove the two are not connected. Then we can treat each problem individually.

I have charts to show which switches to check at various stages of roof opening/closing, but it's a long list. Sometimes it's just easier to take it to a dealer with a Ferrari SD tool.