As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLB A/C WOULDNT PRESS TRIED TO RESET TO MAN AND ALT NO FIX DID NOTEOUTFLOW WAS SHOWING CL GROUND AIR CONNECTION CHECK VALVE BROKEN. REMOVED GROUND CONDITIONED AIR CHECK VALVE IAW AMM 21-21-01. INSTALLED GROUND CONDITIONED AIR CHECK VALVE IAW AMM 21-21-01. OPS CHECK AND LEAK CHECK GOOD, PERFORMED CABIN PRESSURE LEAK TEST IAW AMM 05-51-91-790-801. PLANE HOLD PRESSURE GOOD AT THIS TIME.