How do I repair my Yihua 992DA or what should I replace it with?

[bitogre]

My wife got me a Yihua 992DA because she was concerned about me being exposed to solder fumes.  It works for a while but the fume capture did not work that well.  After a year, a friend used it and overheated the hot air wand.  Now, when ever I plug it into a GFI circuit and turn it on, the GFI pops, even with the Hot Air off.  If I plug it into a non-GFI outlet, the soldering iron works fine (including the fume suction no worse than before).  This makes me think that something in the Hot Air wand is connecting to ground.  I am wondering if I should try fixing it, leave it as is and get a separate hot air gun, or replace it completely.  If I should replace it, what should I replace it with (budget about $150)?  I do need an iron that can solder large wires (putting XT60 connectors onto 10 AWG wire).