What was found
DUE TO PASSENGER 02 SYSTEM DEPLOYMENT, PRIOR TO RETURN TO REVENUE SERVICE C/W AMM 05-51-35 MCI TYPE: SERVICEABLE / NEEDS ATTENTION (FLIGHT 5390) TROUBLESHOT LH PACK FAIL CAUSING CABIN ALT WARNING IN REF TO CRJ 200 FIM 21-50-00 FOR MOMENTARY PACK HIGH PRESSURE AND LT PACK FAIL. TROUBLESHOT CABIN ALT CAUTION AND WARNING IN REF TO AMM 21-33-00. SEE FOLLOWING EAML'S FOR FURTHER TROUBLESHOOTING AND POSITIVE MX ACTIONS REF EAML 185086, EAML 185051, EAML 185027, EAML 185108, EAML 185047, AND EAML 185050.