What was found
AV BAY DOOR CAUTION MESSAGE AT 20000 FEET. HEARD A €ŒPOP€? SOUND COMING FROM THE AV DOOR AND IMMEDIATELY GOT THE AV BAY DOOR MESSAGE. NOTICE THE DELTA P STARTING TO DROP SO EXECUTED THE QHR AND START TO DECENT TO 10000 FEET. BELOW 10K RESET AIRFIELD ELEVATION AND THE PLANE HELD PRESSURE. (FLIGHT 5431) UPON ARRIVAL OF AIRCRAFT INSPECTED PAX DOOR, FWD CARGO DOOR, SERVICE DOOR, AVIONICS DOOR AND AFT CARGO DOOR. FOUND AVIONICS BAY DOOR HANDLE TO BE POPPED OPEN WITH DOOR STILL LATCHED. INSPECTED DOOR SEAL WITH NO DISCREPANCIES NOTED. INSPECTED DOOR HANDLE, CLEANED AND CLOSED WITH NO DISCREPANCIES FOUND. REFERENCE AMM 52-42-00. PERFORMED PRESSURIZATION CHECK OF AIRCRAFT PER AMM 21-31-00. PRESSURIZATION CHECKS GOOD. PERFORMED OPERATIONAL CHECK OF AVIONICS DOOR WARNING SYSTEM PER AMM 52-70-08. OPS CHECK GOOD.