I have two questions about my McIntosh C-24 preamp. 1. It has three broken slide switches and I decided to remove the front panel to look at them and see how hard they are to change. Two more snapped off and that's when it hit me how they probably broke. One switch had been replaced and it also has the factory mod with the springs pressing against the control shafts. So at some point the front panel was removed again and the three switches broke because the panel wasn't removed straight . Is there any place other than McIntosh that has the proper or similar switch? 2. I noticed the left channel the treble seems a little off slightly at times. What's odd is I can set the switch to stereo reverse and it seems to be right, although at certain times everything seems fine in normal stereo.