As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT, MASTER WARNING FOR AFT PAX DOOR OPEN ILLUMINATED. MFD SHOWED L2 DOOR AMBER WITH A BLACK X. FOLLOWED QRH, DOOR WAS SHOWING GREEN INDICATIONS AND PRESSURE WAS NORMAL. MESSAGE CYCLED ON AND OFF APPROXIMATELY 10 TIMES. INSPECTED DOOR SEALS AND DOOR LOCKING MECHANISM. FOLLOWED FIM TASK 52-72-00-810-804A AND PERFORMED L2 DOOR OPS CHECK AND FOUND NO DEFECTS.