As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHL FLT 803 EN ROUTE PHL TO CUN. LOST RIGHT UTILITY BUSS ON TAKEOFF. THE CREW ALSO COULD NOT RETRACT THE LANDING GEAR, AND WERE DOWN TO ONE RADIO. ATTEMPTED 1 RESET. THE CONDITION REMAINED. THE CREW DECLARED AN EMERGENCY AND RETURNED TO FIELD PHL. THE FLIGHT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED RT MAIN DC SECT 1 C/B. RAN ENGINES. RT BUS OPS CHECKS NORMAL.