I left my key in the "On" position with the dashboard warning lights on for about 4 or 5 hours in a 1991 240 Wagon (Ouch.). The next day the electric windows fuse blew. I replaced it and got my windows working again. Then the bulb failure warning light came on and the back tail lights began having trouble. The driver's side light went out (I was told). I checked all the bulbs - all good. I checked the passenger side lights and found some discoloration in a bulb, even though all the filaments looked intact. I replaced the discolored bulb on the passenger side. Then the driver's side tail light stopped working and the bulb failure light came back on. I had just checked the light earlier and it seemed fine and, apparently functioned fine for a while.

Any idea if I damaged circuitry with the key being left on? What should I look for to troubleshoot and in what sequence?

Thanks.