As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, CABIN ALT WARNING PRESSURIZATION MODE AUTO 1 AND RT ENGINE BLEED MSG. CREW DONNED O2 MASK AND DECLARED AN EMERGENCY. (EDC). AIR TURN BACK TO TPA. (ATB). #2 ENG PRSOV REPLACED ON AMES NR 16641-0390. SEE AMES NR 16641-0389/16641-0390 FOR WORK COMPLETED. REPLACED PRSOV IAW FIM 36-10 FAULT TREE 9154805, AMM 36-11-01. A/C RETURNED TO SERVICE.