The camera is fixed. And the boards are visibly damaged. So, that is not the issue.
The issue is that the service center gave me a repair estimate that included the replacement of the "DC/DC board" and "the image compression circuit" (their wording) charged me over 700 euros, and returned to me the repaired camera and the replaced parts, that, on the surface, look just like two DC/DC boards.
Looking up on google, I found a guy in a german board that had a similar problem to mine, had the same boards replaced and paid 250 euros (different country, different repair shop.)
My suspicion is that "the image compression circuit" was just a scam to overcharge the repair.
If someone has the description for part numbers 1S598-014 and 1S598-015, and can also look up the part number of the the image compression circuit, please help.