What was found
WHILE AT HOVER, COMM #2 WOULD NOT TRANSMIT FROM COPILOTS STATION, NO SIDE TONE OR TX INDICATED PILOTS STATION COULD XMIT BUT EXTREMELY GARBLED. RETURNED TO PARKING, AVIONICS ADJUSTED RADIO COMM AND CHECKED OK UNTIL ATTEMPT TO HOVER, THEN FAILED AGAIN. REMOVED AND REPLACED REU IAW AMM 23-00-00, 8-1.