I made components fail, watched the symptoms, and broke it down for you. This video is intended to help you troubleshoot.

Some Tech info. Not sure how useful it will be, but I recorded it anyway.
@ a room temp of 83F
Solenoid- 383ohms
Tray motor- 2.2kiloohms
Water sensor- 858kiloohms (Not sure about this. the sensor is a screw and a wire with a 1/2" air gap between them. The water completes the circuit.)
I'll keep poking around with the multi-meter. When I know more, I'll add more.