I have a dual band single head setup with a 790/890. Everything works great on the VHF side however I cannot receive on the UHF channels unless I put it into monitor. I know the PLs are correct and I have adjusted the open and tight squelch settings as discussed on these forums any thing else that I can do without test equipment? Is there anything that a Kenwood dealer can do? Or is the radio likely too old to be fixed. Is there a way to force it back to wideband?