When I place the gear selector in reverse, I am now getting false alarms for obstructions behind the vehicle. Sometimes it works normally, other times it is a constant beep. Sensors are in perfect condition and rear bumper has never been bumped. I have removed and checked the connector on the module, and all looks good. Is there an easy way to check / change sensors or am I looking at dropping the rear bumper to get to them. Hoping to hear back for a quick easy fix. (besides disabling the system)