I was driving back home at night and noticed that I had no brake lights, maybe that's why those assholes behind me kept flashing their lights when I slowed down. Solution: flip the running lights on when braking.
That happened a week ago on my g/f's 940 which has the same setup. I resoldered all the connections in the bulb failure relay that I could reach and it seems to be woking fine. I highly recommend trying to resolder it before replacing. their probably a little expensive. While your at it I'd resolder the Overdrive relay and fuel pump relay. I've had to resolder 3 relays in the last year on the 2 volvos that I'm responsible for.

Good Luck - Nate
90 745 16v 150k
94 944 8v 155k
86 bmw 325e 160k (for sale soon, we don't need no steenking beamers!)