As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOT DISCOVERED LT FEATHER BUTTON SUCKED IN WHEN BATTERY MASTER TURNED ON. FOUND ON DI BEFORE DISPATCH. WE FOUND THE LT E-HANDLE SWITCH BLOCK PLUNGER JAMMED IN THE DRPRESSED POSITION. THE SPRING THAT NORMALLY PUSHES IT BACK HAD FALLEN OUT DUE TO THE RETAINING CIRCLIP FOR THE PLUNGER BEING MISSING. THE RT PLUNGER WAS THE SAME ALTHOUGH IT HAD NOT JAMMED UP YET.