Drill a 1/4” hole in the right rear corner of the rear panel. The center of the hole will be approximately 3/8” from the right side of the panel (looking from the rear) and 5/8” from the bottom of the panel. Place the hole so that the jack with the new #4 cable will clear the edge of the logic board.
Locate cable #4. Cable #4 goes from jack #4 on the RF board on the top of the receiver to jack #4 on the logic board on the bottom of the receiver. Remove cable #4.
Install new #4 cable by first installing the jack on the new cable into the hole that was drilled in the rear panel. Place the short end of the cable into jack #4 on the logic board on the bottom of the receiver and the long cable into jack #4 on the RF board on the top of the receiver.