As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE DESCENDING FROM FL350 TO FL310, LOST CABIN PRESSURIZATION CONTROL. ACCOMPLISHED EMERGENCY DESCENT. REGAINED CONTROL AT LOWER ALTITUDE. MADE UNSCHEDULED LANDING AT IAH. FOUND AUTO PRESSURIZATION CONTROL INOPERATIVE. PLACARDED AUTO PRESSURIZATION CONTROL PER MEL. THE AUTO PRESSURIZATION CONTROLLER WAS LATER REPLACED. CHECK-C 8-4-98 MCI.