What was found
DURING FLIGHT NR 2804 OUT OF DTW, DME DISPLAY ASSOCIATED WITH NR 1 NAV RADIO, DISPLAYED ON LOWER EFIS TUBE-LOWER LEFT CORNER OF TUBE, IS INOPERATIVE. DME DISPLAY ASSOCIATED WITH NR 2 NAV RADIO DISPLAYS NORMALLY. DME DISPLAY FOR NR 1 NAV RADIO FUNCTIONS AND DISPLAYS NORMALLY ON GROUND. MAINTENANCE REPLACED DME XCVR P/N ON 622-6263-001, S/N ON 4664, P/N OFF 622-6263-003, S/N OFF 1891. MAINTENANCE FOUND CHAFED WIRE AT CONNECTOR TO DISTANCE DATA ADAPTER. REPAIRED WIRE IAW SF340 MM, CHAP 20 AND DME CHECKS GOOD IAW SF340 MM 34-53-00.