I often have a problem with the left channel dropping out on my Sony CMT-CPX1. I can fix it if i give it smack, suggesting it's just a loose connection inside because it affects the speaker and headphones (i.e left channel of everything not just dodgy connection to the speaker). My question is, is it ok to open it up and have a look to see if i can find the bad connection?(with it switched off obviously) ....or is this just asking for trouble/and dangerous?!