As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DEPARTURE AUTOFAIL LIGHT ILLUMINATED NNC COMPLETED. IN CRUISE FLIGHT OFF SCHEDULE DESCENT LIGHT ILLUMINATED FOLLOWED BY AUTO FAIL LIGHT ILL AGAIN AND THEN PANEL WENT BLANK. INFORMED OVER ACARS LOSS OF CABIN PRESSURE, DECLARED EMERGENCY. DIVERSION TO DEN FLIGHT LANDED SAFELY IN DEN. FOUND THAT NR 1 CONTROLLER WOULD NOT POWER UP. REPLACED NR 1 CABIN PRESSURE CONTROLLER, REF AMM 21-31-01 CHECKS GOOD.