Bing,
I'm in the middle of a refurbishing project on my 535, and I'm not suprised at all it fogged up on you.
The seals they use are made from thin maliable material, seem really small and weak, and look like they are really prone to failure.
If any of you guys have upgraded and would like to get an extra $20 I will buy your old one for parts!
I'm just messing with mine as a hobby project (yeah, I'm a geek), trying to rebuild a broken one (which also failed due to fogging, leakage, and weak wires/pins) to get it to work.
Willy
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