I have the same E19 problem – the valve had failed shorted (read 10 ohms) and inspecting the main control board, there was components damaged in relation to this output. I sent the board off to a circuit board repairer who changed a couple of NPN transistors and a resistor. I fitted a new valve which now reads 7200 ohms. Unfortunately – I still have the E19 fault. I suspect there may be further damage on the main PCB or one of the components replaced was incorrect. I have also checked cable continuity between new valve and main control board – which is ok. I don’t suppose I will ever find a schematic for the 9001 140 273 main control board to check the components replaced. Any advice appreciated.