As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CABIN DOOR PROGRESSIVELY GETTING HARDER TO LATCH THAN NORMAL. HAD TO RUN CHECK DOORS CAS MESSAGE 1ST FLIGHT OF DAY AND RESET DOOR. CLEANED AND LUBRICATED HANDLE AND PINS. PERFORMED SENSOR HEALTH CHECK THROUGH CDMS SENSOR OPERATE CORRECTLY WITH DOOR OPEN ANDCLOSED, FOUND DOOR MOTOR ARM PIN LOOSE CAUSING DOOR TO MAKE NOISEAND JUMP DURING OPERATION RETORQUED SYSTEM NOW OPS CHECKS GOODIAW CE-680A AMM 52-10-04