odd swr readings

Hey all, new here, nice to meet everyone. So I picked up a Cobra 200 gtl dx for one of my vehicles. It came in the original box, the previous owner said he had it tuned and aligned but hardly used it. The radio is in excellent cosmetic condition. So here's the issue...On AM in low power mode my SWR high (4:0) but if I put it in high power mode I have a #### near perfect match (1:1) across the board. On SSB I have a great match on high or low power doesn't matter. I know these radios are prone to issues, but this issue is outside of the normal scope I think. I have gotten great reports form all over on SSB and AM on high power, everyone I contact says the radio sounds great! I'd like to talk local on AM low power, but not with that high of an SWR reading. Thoughts? Thanks in advance!

 

first internal then tried to adjust with an Astatic PDC7 SWR Meter. Didn't make a difference. I don't have this issue with my other radios. Lol, never seen an issue like this before. Thanks for responding.

 

Thanks for the replies...shipping radio to a tech tomorrow.