How sure are you about the warranty still being in force? How would Icom
be expected to fix a radio that is modified in some way? This would not
be a safe assumption to make.

I don't like to ass_u_me either!

Had no qualms with sending my unit directly to Kiwa as
after several e-mails back and forth between Kiwa and iCOM they pretty
much said that the warranty would still be good as long as the mods
were done "cleanly". ymmv.