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Hi Maarten and welcome to the site, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.
Initially, let's review, try, check the basics (if have not been done);
Hi again Marteen,
Apologies for the delay as I am currently mobile with sluggish Internet if at all.
Bear with me. I would look into the Service Manual soon as I am back at my workstation.
Do you have a copy of the Service Manual particularly the Troubleshooting section?
That would appear to be Chapter 4 Troubleshooting and yes even the English version has limited schematics.
Would this English version be of help ?
This may be crucial, "...keyboard...resolder...about two evenings it worked ok..." Since it is intermittent, might it be switch bounce; i.e. any of the keys acting on its own every now and then. This may be caused by temperature, humidity, dust, vibrations.
Yes please and would look forward to an update Maarten when able.
Hi again Maarten,
Bear with me as mobile again / field service.
Yes Marteen and time.
Still, let me re-open the question in the hope that another member of the site can provide an alternate approach to your concern.
Thank you for your kind understanding and patience.