What was found
APU DET INOP LIGHT ILLUMINATED & APU FIRE HANDLE LIGHT DOES NOT COME ON. GROUNDED - YES. REVERSED MAINT PROCEDURE, FOUND FIRE/ OVHT CONTROL MODULE FAULTING WIRING OPEN OR DETECTOR FAULT. REF SSM 26-11-31 CHECKED RESISTANCE OF M1755 AND M1756 CHECK OK. FOUND M1925 HEAVILY CORRODED. STUD TWISTED OFF DETECTOR WHEN ATTEMPTING TO REMOVE NUT. REMOVED AND REPLACED M1925 REF AMM 26-15-01. 3 MIG-51A TAGS INSTALLED AND REMOVED. NO DEFECTS NOTED TO RING TERMINALS AT CONNECTION T/1 FOR M1925. APU FIRE DETECTION OPERATIONAL TEST PASS REF AMM 26-15-00. MEL 26-8D CLEARED. PLACARDS REMOVED. SEAMC SCOTT NOTIFIED.