What was found
FLAPS FAILED ON TAKEOFF DURING FLAP RETRACTION FROM 20 DEGREES TO 8 DEGREES. FLAPS FAIL AMBER MESSAGE APPEARED, AND FLAP INDICATION REMAINED AT 20 DEGREES. (FERRIED AIRCRAFT IAW CRJ CONCESSION/INSTRUCTION LETTER NR C095-1379 FROM PHL TO RDU WITH FLAPS AT 20 DEGREES PER GMM). REMOVED AND REPLACED RT FLAP BPSU (BRAKE POSITION SENSING UNIT) IAW DRJ AMM 27-51-10. PERFORMED OPERATIONAL TEST OF FLAP SYSTEM IAW CRJ AMM 27-54-0, NO FAULTS AT THIS TIME. SUBSEQUENT DISCREPANCY: FLAPS HALFSPEED MESSAGE AT 30 DEGREES. REMOVED AND REPLACED FECU (FLAP ELECTRONIC CONTROL UNIT) IAW CRJ AMM 27-51-05. CHECKS GOOD AT THIS TIME. FECU MPN: 860D100-18, S/N 572. (X)