What was found
DURING FLIGHT 2828, OUT OF DTW, FLAPS CYCLE BETWEEN 0-3 DEGREES EVERY 1-2 MINUTES DURING CRUISE. FLIGHT AND FLT LVL 220, INDICATED SPEED OF 180-185. AIR RETURN TO DTW. MAINTENANCE REPLACED FLAP CONTROL UNIT AND FLAP CONTROL VALVE. CONTROL UNIT P/N 8519M3, S/N OFF 061, S/N ON 484. FLAP CONTROL VALVE P/N MP1416100-5, S/N OFF 1365, S/N ON 1606. ALL CHECKS GOOD IAW SF340MM CHAP 27-51-00-5.