As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 712 FROM TOL TO DEN, IN CRUISE AT 31000 FEET, AIRCRAFT RAPIDLY DEPRESSURIZED. CREW EMERGENCY DESCENDED TO 14000 FEET AND STABILIZED PRESSURE AT 5 PSID. AIRCRAFT CONTINUED TO DEN AND LANDED WITHOUT INCIDENT. SWAPPED ENGINE BLEED VALVES WITH NR 2 ISOLATION VALVE. PERFORMED ENGINE RUN TO OPS CHECK SYSTEM. OPS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.