kenwood tk 790

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...

I am curious as to the best settings for firmware for the TK 790/890? I opened the Squelch and still have issues with squelch. What is the best setting for Frequency for the radio? Any insight will be greatly appreciated. Thanks