What was found
DURING CRUISE HF SYS WAS NOT RECEIVING, ELECTED TO RETURN. MX FOUND INCORRECT P/N'S INSTALLED FOR ACCESS COUPLER & TUNER COUPLERS. REMOVED & REPLACED COUPLERS. MX FOUND RECEIVE LINES FOR HF 1 & 2 FROM LIGHT ARRESTOR TO ACCESS COUPLERS CORRODED & SHORTED TO OUTER SHIELD. RAN NEW TO COAX CABLE FROM ARRESTOR TO ACCESS & REPLACED COAX FOR HF 1 & 2 FROM LIGHTING ARRESTOR TO ACCESS COUPLER. INSTALLED NEW CONNECTORS ON BOTH ENDS OF COAX TESTED SYS & DISCOVERED HF NR 1 TUNER WOULD NOT CHANNELIZE, NR 2 WOULD NOT TRANSMIT, HF 2 COUPLER WOULD NOT RECEIVE. REINSTALLED ORIGINAL EQUIPMENT & SYSTEM CHECKS GOOD PER ALL APPLICABLE MANUALS. RECIEVE 5X5 BY DIEGO HF AND AIRCRAFT EN ROUTE. AIRCRAFT RETURNED TO SERVICE.