As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEN - FLT 381 - RIGHT ZONE HIGH-TEMP LIGHT ILLUMINATED IN-FLIGHT. NO LEAKS NOTED IN THE SPINE AREAS. FOUND A LEAK IN THE APU AIR SUPPLY DUCT TO THE Y-DUCT SUPPLYING THE 2 MANIFOLDS. BOTH DUCT RELIEF VALVES NEED TO BE REPLACED. PLACED APU AIR ON MEL. REPLACED THE DUCT RELIEF VALVES. THE FLIGHT CREW FOUND THERE WERE THREE EMERGENCY LIGHTS INOPERABLE. MAINTENANCE REPLACED THE ASSOCIATED POWER SUPPLY.