regarding your p code, try cleaning (dry) the 2 sensors that look up at the transfer belt either side, you will need to slide the belt out a few inches to see them and there is a shutter covering them activated by a white pin on the transfer roller retraction arm. These sensors get contaminated with toner over time.
Failing that you will have a worn out belt or relevant imaging unit it is complaining about. Imaging unit failure was not common on these machines, only in the later C450 engine due to the increased speed and using the same colour imaging units as these.
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