was your mechanic running the contribution test (and was it at normal operating temp when he did it)? Anyway, many times the contribution test will give different results for as many times you want to run it. Cylinder 1 could be low output, but still functioning. You probably fixed cylinder 5 with the UVCH (although the VC gasket still copuld be iffy). Generally the burned harnesses will be shorting the injector wires and glowplug wires, in which case the IDM will shutdown that particular bank of cylinders. Cheers!