What was found
FLT 2561 - OLF - DURING CLIMB, THE CARGO DOOR PRIMARY AND SECONDARY WARNING LIGHT CAME ON AT CABIN PRESS OF 2 PSID. PASSENGER REPORTED NOISE FROM AFT OF AIRCRAFT. CREW RETURNED TO STATION, LIGHT WENT OUT AS ENGINES WERE SHUT DOWN. DOOR CLOSING PROCEDURES OR DOOR HARD TO CLOSE. CLEANED AND LUBED CLICKS, ADJUSTED LOWER AFT CLICK CLACK AND REINDEXED LINKAGE. (M)