cirsurfce

So, my Sony MZ-RH10 has started only recording the right channel. I changed the batteries in the mic, changed mics, plugged in the MD, checked the settings, everything seems right, but it still only records the right channel, with complete silence in the left. Any ideas what could be wrong, or if its possible to fix it? I'd be pretty upset to have dropped $350 and a year later have it not fully work. Hopefully one of you can offer some ideas- Thanks--