What was found
UPON TURNING OFF ANY ICE AT FL200, L PACK HIGH PRESS CAUTION MESSAGE. L PACK SUBSEQUENTLY TURNED OFF. (FLIGHT 5224 - FILED CLOSED)SPOKE WITH CREW AND CREW STATED THAT THEY WERE UNSURE IF L PACK HIGH PRESS MESSAGE OR L PACK HIGH TEMP MESSAGE DISPLAYED. PERFORMED HIGH POWER RUN OF ENGINES AND DUPLICATED FAULT MULTIPLE TIMES PER CRJ 200 AMM 21-51-00-710-801. L PACK HIGH TEMP MESSAGE DISPLAYED MULTIPLE TIMES FOLLOWED BY A L PACK AUTO SHUTDOWN. TROUBLESHOT PER CRJ 200 FIM 21-50-00. REMOVED AND REPLACED L PACK COMPRESSOR OVERTEMPERATURE SWITCH PER CRJ 200 AMM 21-51-25-000-801 AND 21-51-25-400-801. PLEASE REFERENCE AML 1632836 FOR OPS CHECK OF LH PACK.