What was found
FLIGHT 5381 - DURING PUSHBACK RECEIVED A FLAP FAIL CAUTION MESSAGE AT 20 DEGREES, FLIGHT 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.