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