What was found
FLAPS FAIL CAUTION MSG ON APPROACH WHEN SELECTING FLAPS FROM 20 TO 30 DEGREES, EXTENSION. AIRSPEED OF 180 KNOTS & OAT OF -9 DEGREES C. QRH COMPLETE, LANDED WITH FLAPS AT 20 DEGREES. PERFORMED TROUBLESHOOTING IAW FIM REV 48 IAW AD 2009-06-12 PARAGRAPH H 6 I, AMOC LOG 14-105 DATED 12/30/2014 & TS 001100R1 FIM TECHNICAL SUPPLEMENT. FAULT CODES 19C1 & 19C2. FLAPS RESET & OPERATIONS TESTED GOOD IAW AMM 27-54-00.