As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 3849 ON T/O LEFT "AFT ENTRY" LIGHT AND MASTER CAUTION ILLUMINATED. DOOR HANDLE AND DOOR CONFIRMED CLOSED + SECURE. LIGHT ON INTERMITTENTLY ON T/O ROLL AND IN CLIMB BELOW 1000' . CORRECTIVE ACTION: PERFORMED B737 NO-GO ODI 52-71 INSP DOOR SENSOR N.T.F PERFORMED B 737 FRMFIM 52-10-00-810-808. PRESSURIZED A/C TO 6 PSI DOOR HANDLE DIDN'T MOVE. SUSPECT DOOR HANDLE WASN'T DOWN ALL THE WAY PRIOR TO DEPARTURE. A/C OK FOR SVC.