Could be the accumulator at the rightside behind the fan, or the pressure sensor in front of the pressurefilter under the footplate, the one the has the oval shaped connector.(check also wires for this sensor)
Check accumulator, place hex socket in the accumulator, and GENTLY loosen it. VERY GENTLY. Otherwise the gas will all escape..
if it starts to hiss, then there is gaspressure. If oil comes out, replace the accumulator
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