No, but:
I have got a similar issue with my reversing sensors - one of the supply wires or the control unit itself is at fault in my case - I need to find time to get an electrian to see he can do a wiring by-pass, if it is possible rather than buy a replacement unit.
If on cleaning the sensors the problem persists identify if all 4 sensors are working - lean over from the sides and cover each in turn (with ign on/reverse engaged) - the tone will change - if it dosen't on one, that sensor can be checked by carefully easing it out of the bumper and you should find a connection about 6 inches along the supply wire. Disconnect and swop with another sensor that is working, which will then tell you if it is the sensor or the supply.
It does seem the reversing sensors are only covered by a 12 month warranty. And a complete change may mean bumper off to get all the wiring through
But hopefuly it is dirt/polish on the sensor that is easily resolved