What was found
FLIGHT 5239 - DURING TAXI OUT FLAPS FAIL CAUTION MESSAGE ILLUMINATED. AIRCRAFT RETURNED BACK TO GATE. COMPLIED WITH AD 2006-12-21 FLAP CAUTION MESSAGE -FIRST EVENT- MAINTENANCE ACTION, PARAGRAPH (G) 1, 2, 3 (A, B, C). FLAP SYSTEM WAS RESET WITH NO FURTHER FLAP CAUTION MESSAGES.