Tecsun 380 - Longwave stopped working


My Tecsun 380 has always suffered from having "hard to push" buttons.

After a year of light use long wave stopped working.  I can get into MW by pressing the MW/LW button, but if I press it too long I get into the scan mode.

I cannot get into LW with the button.  Nor am I able to directly enter the frequency. For instance, if I enter 153 <enter> it puts me on 1530 khz.

I tried applying WD-40 to the radio to see if it would clean up the button contact.  What else should I do?

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