I bought an 85 Jcm800 4010 a couple of months ago. I have since shipped it across the country twice. On receiving it this time the structure of the combo seems to have weakened a bit. If I'm looking at the front of the amp I can rock it left and right a little bit and it creaks. It's hard to see what is going on with the tolex on the amp. Has anyone else had this happen before and is it fixable?