What was found
FLIGHT 5168 - ON APPROACH FLAPS SELECTED TO 30 BUT REMAINED AT 20 DEGREES. RECEIVED FLAPS FAIL CAUTION MESSAGE. 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.