I've had mine for about 6 months. Trim button went out, emailed support, and they replied with a "How To Replace Switch" pictorial and sent a new one to me (from France). Swapped it out, issue resolved. Best quality I have had.
If your APU is available, it is another emergency option. I have only seen this a couple of times while crewing the Hawg. Bird strike and compressor stall requiring shutdown.
I think there are some other aircraft type "profiles" out there. Check the Helios web site and search Capt Zeen here. Or the download section maybe (I haven't looked).
Realize its an old thread but I used http://forums.eagle.ru/showthread.php?t=125195&highlight=Monitor+Setup+Helios+Loz and the radio fix from Capt Zeen. Still needs some tweaking.