Designer 35RLTS and Jayco Talk...Thanks Frank!!

The only markings on the bulb is 120v 30 watt....its the odd shape that is hard to find. there is very limited space in there. I may end up changing the socket orientation to accomodate a different bulb.

Where do you get access to the mixing valve? I wonder why it is needed. Typicaly, mixing valves are used to temper the water....i guess maybe the water heater is too hot?