Our 5 year old VP-112 is not sealing. vacuum works fine, pistons activate and push up the bar, but it seems that a circuit is not being completed because the bar does not get warm at all. Last week it would work half the time, but it steadily got worse (1 out of every 3 or 4 tries) and now it is not working at all. I tried another sealing bar, but that did not work either, so it seems machine-related. I pulled off the bag-holder assembly and thoroughly cleaned under the mounting plate but that does not appear to tie in to anything and did not make a difference (I wasn't sure what was under it until I pulled it). Searched online and could only find info on sealing bar issues, which I have already eliminated as the cause. Anyone had to tear into the internals to fix a problem like this? Right now it is a 500 dollar paperweight. Thanks!