having this c6950 issue on 3 Taskalfa 3051ci.Different locations same symptoms. Starts with a 980 error code then goes into the C6950 error with main cover open message. Maintenance Mode 163 (Reset Fuser error)is not present as well. Updated to latest firmware replaced IH unit IH PWB Feed PWB 1 according to service manual.Problem still exists. It also points to Power Source PCB and engine board. Any help would be appreciated.
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