As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EWR/TPA - FLT 39, AFTER TAKEOFF, UNABLE TO PRESSURIZE AIRCRAFT. AIRCRAFT RETURNED TO EWR. FOUND LT FLOW CONTROL VALVE FAILED IN CLOSED POSITION DUE TO 3 BROKEN WIRES. REPAIRED WIRES AND C/P REPINNED. PRESSURE CHECKED PER MM 21-00-01 AND MM 21-31-00. OPS CHECK NORMAL. (X)