As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECURRING INCIDENT, MORE THAN FOUR SEPARATE INCIDENTS SPANNING LESS THAN A FIVE MONTH PERIOD AND ON DIFFERENT AC. CIRCUIT BOARD CORROSION CAUSED DECU T4.5 TRIM FAULTS UPON SHUT DOWN, CONFORMATION BOX WIRES CORROSION RESULTED IN DECU T4.5 TRIM FAULT UPON SHUTDOWN AND CONFORMATION BOX WIRE CHAFED CAUSED FALSE T4.5 COCKPIT INDICATION.