What was found
AIRCRAFT NOT PRESSURIZING AFTER TAKE OFF GOING THROUGH 9,000 FEET AND 11,000, LEVELED OFF AT 10,000 FT AND RETURN TO DEPARTURE. REMOVED AND REPLACED SAFETY VALVE IAW AMM 21-32-03. OPS CHECKED GOOD.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AIRCRAFT NOT PRESSURIZING AFTER TAKE OFF GOING THROUGH 9,000 FEET AND 11,000, LEVELED OFF AT 10,000 FT AND RETURN TO DEPARTURE. REMOVED AND REPLACED SAFETY VALVE IAW AMM 21-32-03. OPS CHECKED GOOD.