As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) FLIGHT COMPARTMENT PACK HOT ILLUMINATED AND APPROX 1:30 MINS LATER EXTINGUISHED. LOST CONTROL ON PRESSURIZATION, CABIN PRESS WARNING LIGHT ILLUMINATED AT FL 210. UNABLE TO CONTROL PRESSURIZATION USING MANUAL MODE. AFTER REPLACEMENT OF MULTIPLE COMPONENTS FOUND REPLACED PFCSOV FAILED. PFCSOV LOCKED OPEN. A/C RETURNED TO SERVICE.