as speedy and afrasay said, i would not recommend also sir.
as much as possible, avoid processes like that. since it is already opened and due for change, change it. labor is quite expensive for a general overhaul. if it fails in a few months, gastos ka nanaman.
if it is possible to bring it back to standard specs without using a liner, better. if not, go for a new liner instead.
search kayo sa directory sir mga geniune parts ng mitshubishi.
just to give you a few:
atco sa pasay din daw
bbw sa banawe beside jetcar
coltline sa banawe near ha yuan
bestcolt sa banawe fronting coltline
motorix sa banawe malapit din sa ha yuan