Optional Fan Not Working / Front Lights

This question is about the front half of the trailer (TV side - 2002 2619). I have checked the switch by the vent and it isn't that.

Gremlin 1 - the "optional" vent/fan is not working. This happens to be over the entry door. It was working before. I haven't tested the voltage here but it seems strange that it would suddenly stop.

Gremlin 2 - the front lights seem to be blowing out bulbs. They were working, then they were not. I found out the bulbs were burned out and it happened twice.

I traced the voltage from the switch at the vent to the lamps and they are all up to snuff.

This all occurred while on battery power, not plugged in (rarely camp with hookups). It was surprising that I would suddenly have two bugs in the electrical. Maybe I did something strange. I did check that the wire from the shell into the trailer was secure.

I have done plenty of searching to try to find out other similar issues but most items point to the switch - which is not the issue.

Thanks for any suggestions.