As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: ON THE STATUS PAGE FAULT MESSAGE FOPR BLEED PRSOV, AFT CABIN TEMPS BEING TOO COLD AND UNCONTROLLABLE; AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT LHR. REPLACED RIGHT HAND ENGINE PRSOV - HIGH PRESSURE REGULATING AND SHUTOFF VALVE (AALA202502071825), PER AMM 36-11-09-400-801-001. ALSO REMOVE AND REPLACED RIGHT HAND PRSOV - HIGH PRESSURE REGULATING AND SHUTOFF VALVE CONTROLLER (AALA202502070597), PER AMM 36-11-18 PB 401. INSTALLATION TEST OK. NO LEAKS NOTED.