I have a 148gtl (8719/412) that I have no history on. It is obvious that d44 is blown. I desoldered the 1969 and 2166, and they tested ok using the diode setting on a dvm. I also found 8 volts at the sideband pot, so I assume the voltage regulator is good. Is there anything else I should check before replacing the diode? Also, do I need to keep the board on the 5 pin jack in circuit when I install a 4 pin jack, or can I hooked the wires directly to the 4 pin? Thanks