As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB FWD CARGO DOOR ANNUNCIATION CAME ON AT FL 29000 FT AND CABIN ALTITUDE CLIMBED 8600 FT, NORMAL SHOULD BE 5000 FT ACCORDING TO TABLE. AIR TURNBACK PROCEDURE WAS ACCOMPLISHED. TARGET WAS REPOSITIONED ON FWD CARGO DOOR, BITE WAS PERFORMED ON BOTH CONTROLLERS AND NFF. MANUAL PRESSURIZATION WAS ACCOMPLISHED WITH 3 PSI ACCORDING AMM 21-32-00.