I initially replied to Tom and then noticed there were quite few posts here That said, apologies as I can only tag two others being a newbie here.
Firstly, thanks for the warm welcome. As a past owner of 2 GTOs (well, one was a Stealth R/T in the US) it’s great to see so many enthusiasts keeping these great cars on the road where they belong.
A summary of what we do re the climate control is in my reply to Tom and here: https://www.motivelectronics.com/product-page/mitsubishi-gto-3000gt-climate-control-panel
I have a background in electronics design so to get these repairs right I reversed engineered the power supply circuit that causes the display failures. Although the failures are all caused by leaking capacitors the repairs needed do vary from unit to unit (the reason why some repairers end up ‘smoking’ the 1W resistor or seeing red ‘grid lines’ on the display). It all depends on what gets ‘eaten’ by the leaking caps!
We’re also now setup to repair the instrument cluster speedometers and tachometers (not on the website yet so please ping me here for that).
On top of that, I’m also working with Rob @ EvilEmpire to repair other GTO modules. This does depend on demand though so let me know what else causes a pain down in the module department
Happy to answer questions.