Nick
2 watch points, the 2 wires from the screen are very flimsily attached to the heater element in the glass and may have open circuited and also as the MMC in a feat of staggering incompetence simply trap the wires between the dash and the wood frame they may be so crushed that the wire(s) are broken. The 2 wires from the screen are connected to the harness behind the dash with bullet connectors.