Hello and thank you for using JA.
The answer to your first question is "yes" they could be soldered together but make sure engine is off when you do it. Second you don't need to be alarmed, if this is connected to the power steering, or in any other parts of the car, most likely this is a sensor, just needed to be connected to where every it belongs, to send signal to the control pannel of the car,
and not the Attendant won't do some thing like that, besides, I don't think you and the attendant know each other and has conflication in the past, but still is highly doubt that, because it's too minor for the attendant to vandalize some thing like that.