Best done on a clean bench or at the kitchen table. After you have cleaned the circuit board tracks give the little brass contacts a gentle 2 or 3mm nudge upwards with a miniature screwdriver so they are making better contact with the tracks.
Take a before and after picture for reference...just in case something goes ping 
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Liam...
'96 854 TDI SE, '99 V70 2.5D S, '05 C70 2.0T Collection, '05 S80 2.0T SE, '15 V70 D4 SE Lux Nav.
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