TR brake lights not working?

you checked if you have 12 V at the lights?
may be both bulbs are not ok anymore?
or bad connection from the bulbs to the lights?

 

I'd put my money on the white connector connection in the w or y connector being bad (in fact, I had so much trouble with the w connector red wire connection that I added a jumper wire to directly connect the red wire in the w connector to the red wire in the y connector):
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For a first test, just try wiggling/unplugging/inspecting/reseating the w and y connectors. Unless you've gone to LED rear brake bulbs, the total current for the rear brake lights is quite high (like ~8.5A IIRC) so having those w and y white connectors "weaken" with time shouldn't be unexpected (and they are only slight less poorly designed than the fuel pump connections ).

 

No (dielectric grease is for environmental protection -- it does nothing to reduce the heating which is the root cause of the trouble, and it's messy ). IMO, you need to do something that either improves the current carrying capability of the stock connections or bypasses them (like adding the jumper wire in parallel to the stock red wire path going thru the fuse-relay PCB -- I also did another jumper in the white terminal 50 start command path going from the white wire in the w connector to the white wire in the y connector, and consider those two modifications as required on any TR).

The current is the same in the three connections noted in the photo, but the red wire in the w connector is just a single wire (vs multiple wires for the LN wires in the w connector and the red wires in the y connector) = the red one in the w connector suffers the most as the others (with more total metal in the wires) are better at conducting the I^2*R heat out of the contact points of the terminal.