What was found
CREW REPORTED STAB OUT OF TRIM LIGHT ILLUMINATED ON APPROACH. ELECTRIC TRIM INTERMITTENT DURING MISSED APPROACH. MAINTENANCE CARRIED OUT DFCS BITE TEST IAW FIM TASK 22-11 TASK 801. LAST FLT LEG FAULTED STAB TRIM "A" MOTOR MSG, FAULT CODE 22-11177. CLEANED S245 SWITCH ON FLAP DRUM DUE TO EVIDENCE OF MOISTURE. UNABLE TO DUPLICATE FAULT ON GRD. CONFIRMED A/P STAB TRIM WAS AT FAULT DURING APPROACH AFTER INTERROGATING DFCS IAW FIM 22-11 T801, FAULT CODE 22-11177 (CH A), ALONG WITH MANUAL ELECTRIC TRIM AS REPORTED BY FLT CREW. DUE TO INTERMITTENT NATURE OF SNAG STAB INTERLOCK RLY (R580) REPLACED AND TESTED SERVICEABLE IAW AMM 27-41-98. STAB TRIM CTL RLY (R64) REPLACED IAW WDM 27-41-12 AND TESTED SERVICEABLE IAW AMM 27-41-71. STAB TRIM MOTOR REPLACED AND TESTED SERVICEABLE IAW AMM 27-41-71.