I'm a brand new e biker and forum member and recently purchased a very nice used (220 miles on it) RM load 60. I absolutely love riding it up here in the desert of southeastern Washington along the Columbia river. I did not get any operating/user manuals with my bike and have limited mechanical skills. When my rear tire went flat I took it to a local bike shop and got very poor service. Now my shifter no longer works correctly and my assist controller is messed up. The shop returned their labor fee but I won't have them work on my bike again. Any advice would be appreciated.