As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, ACFT WAS AT 5000 FT, CABIN ALTITUDE WAS ABOUT 2000 FT. CAPTAIN TURNED OFF BLEEDS, ACFT CONTINUED TO PRESSURIZE DOWN TO APPROXIMATELY 500 FT. CABIN ALTITUDE WITH BOTH BLEEDS REMAINING IN THE OFF POSITION. AFTER RETURN, FOUND BROKEN WIRE 2121-2F22 IN NR 1 NACELLE. ALSO, FOUND NR 2 PRSOV INOPERATIVE. R & R NR 2 PRSOV IAW MM 21-11-11. GROUND RAN ACFT. OPS CHECKED GOOD AT THIS TIME.