When I took my printer to my systems support engineers one of the partners asked "Who has been messing with this? I assured him that nobody had touched any of the leads. After several minutes of severe questioning he said "I believe you thousands wouldn't" They agreed to repair it without charge and we attributed the damage to “computer gremlins..
When I returned to pick it up, I told him that I had discovered the most likely suspect for the phantom technical support engineer.
I hope that you enjoy watching a culprit in the same genre as my computer gremlin.