What was found
(CAN) FLAP FAIL CAUTION ILLUMINATED INBOUND THEN ON APPROACH FLAPS SELECTED TO FLAP 8 AND THE FLAPS FAIL CAUTION LIGHT ILLUMINATED IMMEDIATELY. CREW REPORT THAT THEY DID NOT ENCOUNTER AND ICING OR RAIN ON ROUTE. THEY DID PASS THROUGH A CLOUD LAYER. OAT AT TIME OF INCIDENT WAS +7 DEGREES. CIRCUIT BREAKERS RESET AND CAUTION WENT OUT, FLAPS OPERATED FULL TRAVEL 10 TIMES WITHOUT A RE-OCCURRENCE. AFTER FREEZE TORQUE TESTING AND TROUBLESHOOTING ALL 8 FLAP ACTUATORS REPLACED, LUBED, RIGGED, AND FUNCTION CHECKED NUMEROUS TIMES. A3 CHECK TASKS, CLEAN AND LUBE FLEX DRIVE TASKS AND PRE WINTER FLAP LUBE TASKS COMPLETED. CHECKS SERVICEABLE.