I am thinking it is the encoder belt - long clear plastic belt about 1/4 inch wide. It sits behind the print head and runs left to right. If this has jumped out of the guide rail of the print head it will cause head to malfunction with various error messages including that one.
To be frank I am not particularly clear on this. The reason being is the wire is a Shielded cable.
So, is the Shield soldered on the first piece and the inner wire soldered on the second piece
OR
is the Shield removed and only the inner wire soldered ??