As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REF LOG PG 124783, BLOCK 1, ON CLIMB-OUT, RECEIVED (CABIN ALT) MESSAGE AT 10K FEET. COMPLIED WITH QRH. FOUND PRIMARY OUTFLOW VALVE STUCK IN OPEN POSITION. REPLACED PRIMARY VALVE IAW AMM 21-32-01. OPS CHECK COMPLIED WITH. AUTO OK, MANUAL FAILED.