Blade
You might try this spray from Jaycar before you go to the expense of replacing the module. The Army use it for radio's etc and it most cases it works ! Just spray and clean with a small fine paint brush.
INOX-MX3 Lubricant, Corrosion Inhibitor - Can | Aerosols | Chemical Aids | Service Aids | PRODUCTS | NA1024 | Jaycar Electronics
Worth a try !
Laurie



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