few years back i replaced before. the controller not expensive. labour from proton expensive. end up rm100++ i think
But only repalce the board yea.
the key,immobolizer and casing not replaced

maybe u should consider look for locksmith to do for you

My key masuk machine more than 5 times already after replacement.

usually if masuk machine i open the casing remove the battery .
let it dry a day before using it again.
Still functional except the alarm button.

u can consider drying ur componenent before trying.maybe ur pcb board already shorted as u operate when its wet