What was found
ON DESCENT THROUGH 12,000 FT, MASTER DOOR WARNING ILLUMINATED. WARNING WAS FOR SERVICE DOOR. WHEN DESCENDING THROUGH 8,000 FT THE AFT F/A REPORTED THAT THE DOOR POPPED AND SLAMMED SHUT AND ALL INDICATIONS NORMAL AFTER THAT. INSPECTED THE SERVICE DOOR WITH NO DEFECTS NOTED. PERFORMED OPS TEST OF THE DOOR IAW AMM 52-41-00-710-801. NO DEFECTS NOTED. PERFORMED GROUND PRESSURIZATION IAW AMM 21-00-00-863-802. NO DEFECTS NOTED. RETURNED TO SERVICE.