Anthem AVM20 remote control buzzing

I've got an older AVM20 preamp (still sounds great) and the remote control just started making a constant annoying buzzing sound that won't shut off and is loud enough to hear during music. Is there a way to fix this or am I left searching for a replacement? Anthem says the factory one is $129 but would like to spend a lot less; only need basic functions. I like direct access buttons like the one that came with the preamp versus screen/menu types like Pronto. Thanks...
You could invesigate if Harmony can be programmed for this device but it will probaly cost you close to what the Anthem remote does.
Are you stating that the remote itself is producing the noise or the pre-amp? If the handheld remote is buzzing and I am assuming you have tried removing the batteries for a minute or two and pressing all the buttons to remove any capacitance energy stored,t hen new batteries reinstalled? If that doesn't work can you open the remote case and check for loose parts? I have never heard of a remote making any noise other than "crunch" when you accidentially step on one.
Why not try a $15-30 universal learning remote.The kind you point your old remote at to teach it new codes.That way,you can have the buttons do what "you" want.Walmart even a possibility.
Thanks for suggestions. Theo the buzzing is from the remote not the preamp and loud enough to disturb listening; the remote still functions although no buttons light anymore; batteries have been replaced; the remote case does not open easily and looks like it would have to broken open, which I may try since it would be a useless remote anyway. It started as a high pitch whine now is an annoying constant buzzing. Anthem says unusual and that Pronto has Anthem codes but I like the hands on style versus menus. They also say to check the Harmony line as they may have Anthem codes or I may look at a learning remote. Thanks again.