From the service manual, both errors relate to the scanner unit:
[5012] An error occurred in the scanner FB motor.
(1) Cable connection (2) Part replacement: - Scanner unit
[5050] The AFE was faulty.
(1) Cable connection (2) Part replacement: - Scanner unit
I don't know if the following YouTube video will help, but you could watch and see if it applies to your printer.
Error 5011 and 5012 Printer Canon MG 2570 MP 237 MP258
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