What was found
DFW - FLT 3243 - ABORTED TAKEOFF AND RETURNED TO GATE. DURING TAKEOFF ROLL A STRONG SMOKE ODOR WAS NOTICED IN THE CABIN. FOUND NR 1 DPU LOOSE IN RACK. REMOVED NR 1 AND NR 2 DPU`S MPU, RELAY 69PC, NR 1 EFIS WIPER PANEL AND NR 2 EFIS WIPER PANEL. NO ELECTRICAL SMELL DETECTED. REINSTALLED NR 1 DPU, MPU AND BOTH EFIS/WIPER PNL. RAI NR 2 DUP. PERFORMED CHECK ON CAPT AND FO EFIS. OPS CHECK GOOD. RETURNED AIRCRAFT TO SERVICE. (M)