As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#1853, JFK-PBI. (AIRCRAFT PERFORMED AN AIR TURN BACK TO JFK) 'WHEN CLIMBING THR 10000 FT STARTER TP HEAR LOUD POPPING NOISE AT L1 DOOR AS IF SOMETHING HITTING FUSELAGE; ACCOMPLISHED A GVI "CHAP 5" INSPECTION FOUND NO LOOSE PANELS OR ADDITIONAL SEIGHT AS DISCOVERED LOOSE/MISSING. DOOR SEAL INTACT + PROPER CONDITION. REF AMM 64-61-29.'