On the subject of geckos blowing the circuit board this is what happened to my KT series Mitsubishi,only about 3 years old and little used. The guys were unable to fix it so the missus bought the GT series Mitsubishi (25k for 12,000btu) which is about their top model.
So I now have a relatively new broken one sitting in the garage. Does anyone know of any specialists (Korat area) who might be able to repair it? Mitsubishi themselves ?