As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED LOSS OF RUDDER TRIM. NO VOLTAGE NOTED AT A135 PIN R. REMOVED FWD CENTER CONSOLE PANEL WITH TRIM INTERRUPT SWITCH. 28V INPUT POWER VERIFIED AT PNL133 PIN 1. BACKPINNED PIN 7 ON PNL133 AND FOUND NO OUTPUT POWER. BENCH CHECKED PNL133 AND FOUND NO CONTINUITY.