I have a new Metro HP 48 " with ECS. The drive wheels have a squeak while in any gear 1 thru 5 in motion. I took both drive wheels off and greased the wheel hub zerks. I still have a squeak. I think it might have somthing to do the brake linkage. What if anything is left to grease or oil? I would like to do it myself if I can. I want to save a trip to the dealer.