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Hello Mopsbauer, welcome to the forum. I am a big fan of older Magnum radio's, I still own five of them. They made several versions of the 257, since you said yours is blue I'm betting it's mosfet powered. Can you verify if it has the RFX-75 on the back? If so it is the 80 watt HP version, it not then it's the standard 40-50 watt version.


To be honest of the radio is performing well it really does not need anything done to it. If you must have the display changed the below listed places all do well with Magnum radio's.


1) http://www.superiorcb.com/


2) https://customcbradios.com/


3) https://www.bobscb.com/     (if they are doing mail in repairs)


If you do send it in I would say all it would need would be a display color change and a check over to make sure it's functioning like it should. I recently had two radio's worked on by Superior CB, came out great.