Do you know the model number Cliff.
If its the one with a soft button control panel on the top like this one https://www.ebay.co.uk/itm/16545490...pid=5339023013&customid=&toolid=10001&mkevt=1
Then take it out and disconnect the leads and give the pcb board a good clean with a toothbrush or similar and some electrical contact cleaner spray.
If there is any damp there will be some grey powdering corrosion on the soldered joints. If it works after you have cleaned it best to then coat the board with an electrical lacquer spray.
Best of luck
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