What was found
(CAN) ON APPROACH, "FLAPS FAIL" C UPON SELECTION TO 8 DEGREES. ABORTED APPROACH. AFTER SELECTION BACK TO 0 DEGREES, "FLAPS FAIL", C, DISAPPEARED. SECOND APPROACH PERFORMED AND ACFT LANDED. NO MDC MESSAGES COULD BE RETRIEVED. FLAPS/SLATS SYSTEM OPS TEST PERFORMED WITHOUT ANY FINDINGS. ACFT IS BACK IN SERVICE.