What was found
PHL/IND - FLT 1799 - ON CLIMB-OUT FROM PHL AT 1,000 FEET WHEN FLAPS WERE RETRACTED, FLAP ASYMMETRY' ILLUMINATED AT 8 DEGREES OF FLAP. FLIGHT RETURNED TO PHL WITHOUT FURTHER INCIDENT. NO EMERGENCY WAS DECLARED. MAINTENANCE REPLACED THE RIGHT INBOARD FLAP SYNCHRO AND RIGGED THE SYSTEM. (X)