What was found
PDIS 138 52-70 1261 29NOV17 MEM SHORTLY AFTER LEVEL OFF AT FL370 "MAIN CARGO DOOR" EICAS ALERT ILLUMINATED. COMPLIED WITH ORH PROCEDURES. DESCENDING THROUGH 17,000 ENROUTE TO 10,000 MAIN CARGO DOOR LITE WENT OUT. CHECKED GAP ON MAIN CARGO DOOR PROX SWITCH S892. GAP WAS GOOD AT .070". LIMIT IS .070" TO .130" PER M/M 52-71-09-2. NEED TO CHECK DIMENSION "B" ON PROX SWITCH S892 PER M/M 52-71-09-2 PG 20 OF 25. PERFORMED OPERATIONAL CHECK OF MAIN CARGO DOOR IAW 52-32-00-05 NO DEFECTS NOTED.. BITE CHECK OF PROX COMPUTER SHOWED NO FAULTS DURING OR AFTER OPERATIONAL CHECK. ALSO CHECKED GAP ON PROX SWITCH DEM B IAW 52-71-09-2 DEMENTIONS ARE WITHIN LIMITS OF AMM .