Okay, I picked up my Yamaha TRB-5 late last night and noticed that the volume knob on it was all messed up. This was a little weird since I had just played 2 shows last weekend with it and it was fine. I opened up the preamp compartment and it is definitely being caused by that loose knob (I can mess with it and get it to work properly). Is it an easy repair to get done? It is the old-style TRB-5 with the mids knob in 3-click position (bass is no more than 4 years old and I got it used). I am in no way an expert at repairing gear and would be too worried about breaking something to try and fix it myself.