i get the same problem, when i start the car and press the brakes the light comes just comes on for a split second and then goes off and doesn't come bk on, so may be i need to do the same checks. to be sure i find it, which carpets do i actully lift? and what do i look for?. and this could be related to my fuse burning, when i connect the reverse wire to the reverse circuit fuse no12 10amp fuse starts to burn away, and the mechanic said something was earthing . so right now the wire is disconnected from the circuit and i have no reverse lights.
i would actually do it now, but its 10 o clock in the night, so can't wait for tomorrow, quite excited i might be able to fix some problems. thanx guys