VEMS EGT amplifier issue?

[Wolf_Tm]

Hi guys,
with engine off and at ambient temp, I'm getting 2.5 volts out of Pin6 (0-5V output, 1V/233.3C), thus getting 580°C instead of an ambient 20°C.

Tested Pin7 DVM output (1V/100°C) and getting 0.7 volts (and not 5.8 volts, roughly corresponding to Pin6 2.5 volts).

EGT sensor is K type yellow-red wires:
        yellow = green (plus wire) to board GND
        red = white (minus wire) to the board cathode on corner

Any help? Thanks