Canon printer - for spares or repair (Twyford RG10)

Canon PIXMA MX725 colour printer, for spares or repair.

The printer worked fine for 9 years, but recently stopped working displaying the following 2 error codes:
B200 - Printhead malfunction (overheating or electrical malfunction)
B1403 - The type of print head is incorrect

The "small black" and "large black" cartridges have been replaced with brand new ones, but that didn't fix the problem.

I also tried cleaning the print head using warm water, but that did not fix the problem.

If you want to take it to try to fix it, let me know.