What was found
(CAN) BEFORE TAKEOFF, PILOT TRIED TEST ON ALL WARNING SYSTEMS. NO LIGHTS ON. A BROKEN GROUND WIRE ON THE TEST SWITCH WAS FOUND.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
(CAN) BEFORE TAKEOFF, PILOT TRIED TEST ON ALL WARNING SYSTEMS. NO LIGHTS ON. A BROKEN GROUND WIRE ON THE TEST SWITCH WAS FOUND.