As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACFT RETURNED DUE TO DURING CLIMB THE "EQUIP" LIGHT TURNED ON CROSSING OF 12,000 FT TO 13,000 FT. MX PERSONNEL PERFORMED REVISION TO ELECTRONIC EQUIPMENT ACCESS DOOR IAW AMM 52-48-41; BITE WAS PERFORMED TO BOTH CABIN PRESSURE CONTROLLERS IAW MM 21-32-00, THE PRESSURIZATION VALVE WAS CHECKED IAW AMM 21-31-03, NO FAILURES WERE FOUND.