What was found
FLT 1266, RSW-BOS. AFT DOOR LEFT SLIDE WON'T ARM (IN FLIGHT). ACCOMPLISHED VISUAL INSPECTION OF THE AFT LT DOOR. REMOVED BUSSLE AND INSPECTED SLIDE AND REINSTALLED BUSSLE, NO DEFECTS NOTED. ARMED DOOR AND PRESSURIZED A/C, NO DEFECTS NOTED. ARM AND DESARM HANDLE OPERATES NORMAL, REF AMM 52-13-00 AND 05-53-00-05-00. A/C OK TO CONTINUED SERVICE.