As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING THROUGH 12,000 MSL, THE CABIN ALTITUDE INCREASED SIGNIFICANTLY.NO MESSAGES OR NOTIFICATIONS AND THE MASKS DID NOT DROP. CABIN ALTITUDE STABILIZED AND HELD AT 7000-8000 FEET DURING OUR DESCENT. PERFORMED SATISFACTORY PREFLIGHT SYSTEM TEST OF PRESSURIZATION SYSTEM IAW AMM 21-30-00. NO DEFECTS NOTED AT THIS TIME. PERFORMED SATISFACTORY GROUND MAINTENANCE TEST OF PRESSURIZATION SYSTEM IAW AMM 21-30-00. NO DEFECTS NOTED.