As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT BLEED WARNING/ CAUTION MSG WITH L PACK AUTO SHUTDOWN. LOSS OF PRESSURIZATION. / REMOVED AND REPLACED THE LH PRECOOLER IAW CRJ 900 AMM 21-53-04-000/400-801-A05. REMOVED AND REPLACED THE RH CONDENSER/REHEATER IAW CRJ900 AMM 21-51-14-000/400-801(A01). PERFORMED LEAK CHECK IAW CRJ 900 AMM 21-51-00-790-801. LEAK CHECK GOOD AT THIS TIME.