What was found
FLIGHT 5664 RECEIVED A FLAP FAIL CAUTION MESSAGE DURING TAXI OUT, AIRCRAFT RETURNED TO THE GATE. COMPLIED WITH AD 98-20-01 FLAP CAUTION MESSAGE FIRST EVENT MAINTENANCE ACTION, PARAGRAPH (B) 1, 2, 3 (A, B, C AND E). FLAP SYSTEM WAS RESET WITH NO FURTHER FLAP CAUTION MESSAGES.