What was found
ENGINE VALVE CLOSED LIGHT ILLUMINATED DURING COCKPIT PREFLIGHT. ACFT GROUNDED. TSR ISSUED. ACCOMPLISHED STEP NR 3 OF TSR. NO DEFECTS NOTED. REPLACED PASS-THROUGH DM6. ACCOMPLISHED STEP 4 OF TSR. FOUND CORROSION ON D30116 SIDE OF DM24 PASS THROUGH. REPLACED DM24 PASS THROUGH REF SWPM 20-60-06 AND MM WD'S 77-12-21, 80-11-11, 76-21-21. RECONNECTED CONNECTORS D30114 AND D30116. ACCOMPLISHED STEP 5 OF TSR AND OPS CKS NORMAL REF FIM 73-06 TASK 804, MM24-21-00-700-803, 24-11-00-700-803, 71-00-00-700-808-F00 TEST 13, 3A,2 AND 1.