As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DURING FUNCTIONAL CHECK FLIGHT OF CABIN PRESSURIZATION, PRESSURIZATION WAS UNCONTROLLABLE ON CLIMB. FLIGHT RETURNED TO CLT LANDING SAFELY. REPLACED BLOWN RIGHT HAND PACK BELLOWS (AALA202204065347) PER AMM 36-11-49. REPLACED RIGHT HAND T DUCT (AALA202204069719) PER AMM 36-11-49. LEAK CHECK GOOD.