Hi, ive owned my C5 since Christmas, bought new battery for it and has been great...until.... last wkd i changed the rear brake cable and whilst it was on its side sprayed the back right hand wheel with WD40 (it had been squeaking for a while). Pedalled the c5 up the road and back and was fine + it had fixed said squeeky wheel. I then put battery in and hooked up..when i tried power all i got was a loud grating noise from what im guessing is the motor. As this has been fine up until the point i a) sprayed WD40 around that area and b) had it tilted on its side - i wondered if anyone had some suggestions as to what the problem could be? many thanks!