As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRSOV R STATUS MESSAGE. REPLACED CONTROLLER FOR CABIN AIR SUPPLY. EXAMINED PRSOV SENSE LINES PER FIM 36-11 TASK 805. UNLOCKED VALVE. BLEW OUT SENSE LINE. WRENCHED CHECKED SENSE LINE 'B' NUTS. GROUND RAN RT ENG PER JRH 2-2-1. MAT SHOWS PRSOV NOT ACTIVATED. OK FOR SERVICE. NO MESSAGE ON EICAS.