As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOST CABIN AT FL 400. HEARD PRESSURIZATION BUMP AND CABIN BEGAN CLIMBING RAPIDLY APPROX 1500FT/MIN OR GREATER. GOT CABIN HIGH EICAS. AFTER LANDING FELT ALMOST NO FROM ECS. REMOVE DUCT TEMP LIMITER AND INSTALLED NEW DUCT TEMP LIMITER REF MM 21-50-03. PERFORMED LEAK CHECK AND PRESSURIZATION. MM 21-00-00. OPS CHECK GOOD AT THIS TIME.