As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL 330 HEARD LOUD BANG IN AREA OF FWD GALLEY. FLOW LIGHT ILLUMINATED AND CABIN STARTED CLIMBING RAPIDLY. DESCENDED TO FL 210. CABIN STABILIZED FOR 10 MINUTES. FLOW LIGHT THEN RE-ILLUMINATED AND CABIN STARTED CLIMBING AGAIN. DESCENDED TO 10,000 FT AND DIVERTED. LANDING WAS NOT OVERWEIGHT. FOUND AFT CLEVIS OF FWD STAIR DOOR BROKEN. REPLACED SAME, REF MM. PRESSURIZED A/C, NO LEAKS NOTED.