As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE CLIMBING THE RIGHT PACK (ONLY OPERATIONAL PACK) SHUT OFF AND AIRCRAFT BECAME UNPRESSURIZED. EMERGENCY DESCENT WAS COMPLIED WITH. RETURNED TO FIELD. NO PACK HI TEMP OR HI PRESS CAUTION MESSAGES OBSERVED. (FLT 4832) FO: 09/18/2018. CLOSED REMOVED AND REPLACED THE RT PACK PRSOV IAW AMM. OPS CHECK GOOD.