What was found
FLT 6340 - EWR-BOS - DURING TAXI OUT, EXPERIENCED THE LOSS OF THE NR 1 COMM SYS FUNCTION. THE A/C RETURNED TO GATE WHERE MX CONTROL AT IAD WAS NOTIFIED. MX CONTROL COORDINATED WITH THE IAD MX DEPART PERSONNEL TO POSITION A MX PERSON AND THE PARTS TO THE EWR STA TO CORRECT THE DISCREPANCY. IAD MECHANIC ARRIVED AT EWR AND TROUBLESHOT THE DISCREPANCY. THE MECHANIC THEN REPLACED THE FAILED NR 1 COMM UNIT AND RELEASED THE AIRCRAFT FOR SERVICE. (M)