As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TRANSFER OF BLEEDS FROM APU TO ENGINE CAUTION MESSAGE, L-PACK HI PRESSURE FOLLOWED. QUICK REFERENCE MANUAL CAUTION STILL PERSISTED AIRCRAFT COMPLETELY DEPRESSURIZED. PERFORMED OPERATIONAL CHECK OF AIR CONDITIONING SYSTEM WITH 2 PACKS; OPS CHECK NORMAL IAW CRJ AMM CH 21-51-00.