Inconsistent Voltage in washing machine

On the power supply cable going to the display board the voltage is dropping from 7V slowly going down to 2V within 15 seconds and then back up and down constantly.

When we checked the main PCB, the current is normal at 230V but some black and pink plugs on it giving measurements 170V going down to 120V about the same as the power supply cable.

Also checked the IMI filter and the current is the same on entry and out.

Where should we look for faults? What should we do to fix it? We were told the PCB was the problem at first by the repairman.

We are unsure where to go with the problem at the moment so we decided to ask here for possible solutions. I appreciate the time anyone decides to give this.

Here are some picture that I hope can help. The whole washing machine with a few parts uninstalled and the sticker at the back.