What was found
FLAP FAIL YELLOW CAS: FLAP FAIL CAS MESSAGE. FLAP FAIL MESSAGE APPEARED WHEN THE FLAP WERE MOVING FROM POSITION 2 TO 4. FLAPS ARE STUCK BETWEEN POSITION 2 AND 4. // SIGNOFF // POWERED AIRCRAFT AND CHECKED CAS. NO RELATED CAS NOTED. PERFORMED FLAP OPS CHECKS APPEARS TO BE NORMAL. PER CONTACT CENTERS RECOMMENDDATION COMPLIED WITH FIM SUSPECT FAULTY PDU. PDU IS FLAGGED REMOVED AND REPLACED FLAPS POWER DRIVE UNIT FUNCTIONAL CHECK GOOD. WORK PERFORMED IAW EMB-505S AMM 27-51-07/400