As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ATB- DUE TO CABIN ALT WARNING CAUSED FROM LEFT BLEED TRIP CAUSING LEFT PACK OFF WITH RIGHT PACK ON MEL. O2 MASKS DEPLOYED. REPLACED HPSOV. REPLACED FAN AIR TEMP SENSOR AND OVER TEMP SENSOR. OPS CHECK NORMAL. (8644527) (AIRCRAFT GROUNGED)