As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LGW - FLT 49 - EN ROUTE CDG/PIT, WITH RIGHT IDG ON MEL AND THE APU OPERATING, THE APU 'FAULT' LIGHT ILLUMINATED AND THE EICAS MESSAGE 'APU FAULT' APPEARED. THE APU WAS SHUT DOWN. THE FLIGHT DIVERTED TO LGW AND LANDED WITH NO FURTHER INCIDENT. MAINTENANCE REPLACED THE APU FUEL CONTROL. (X)