As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE RECEIVED A LEFT PAC WARNING THAT BECAME A LEFT PAC CAUTION MESSAGE. WHILE FOLLOWING THE QRH PROCEDURE WE LOST THE RIGHT PAC. WE MADE AN EMERGENCY DESCENT TO 10000' AND DURING THE DESCENT THE PASSENGER MASKS DEPLOYED. (FLT 5292) 06/15/2018 CLOSED REMOVED AND REPLACED LT BLEED LOOP MT142 IAW AMM. OPS CHECKED GOOD.