You could get them fixed but it would probably cost the same or more as getting a new HU, Take a look at the new Eclipse and kenwood stuff they have excellent perfomance and features with a good price and a very low rate of failure.
panasonic too*** verrrrrrrrrrrrrrry low fail rate and look kool //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif