As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
F/A TRIED OPENING CABIN DOOR AT GATE AND WOULDN'T OPEN. F/O TRIED TO OPEN IT AND IT OPENED WITH DIFFICULTY. AFTER DOOR OPENED, IT STARTED TO RETRACT ON IT'S OWN. PULLED CIRCUIT BREAKERS. CLEANED POWER ASSIST SWICH. OPS CHECKED GOOD IAW AMM 52-60-00.