What was found
PDIS 645 21-30 1907392 14MAR19 ROA CLOSE AT FLT LEVEL 250 CABIN GOT WARM IN BACK, CAPT LOWERED TEMP AND WENT INTO MANUAL MODE AT WHICH POINT PACK 1 CLOSED. CABIN ALTITUDE SHOT FROM 4000 TO 7000 FT IN SECONDS. STARTED DECENDING PACK 1 CAME ON AND DIVERTED TO ROA. FACT 14MAR19 04:14 ROA OPS CHECKED NR 1 PACK PER AMM 21-20-00 RAN CABIN TEMPAT FULL COLD AND FULL HOT IN AUTO AND IN MANUAL. OPS CHECK GOOD. PACK 1 DID NOT SHUT DOWN. NO DEFECTS NOTED AT THIS TIME.