valco supro

i just purchased a valco supro 1953 i actually stole it for 125 bucks the model number is x25308 from what i can tell it is all original and i bought it from the original owner i even have the supro guarantee bond that came with it "even though i believe it has expired haha" anyway somebody has replaced the power cord with a lamp chord which i know is to smal of a chord but the tubes seem to get quiet warm and even the box gets a little warm my first question is isthere a way to clean the tweed cover and my other is what would it cost for me to have you check it out and change the power chord and look to see if it needs anything else you can e-mail me at jbth12@gmail.com with the price if you dont want to post it on here thanks