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It's also possible that the tracks inside the membrane are corroded to breaking point someplace. The tracks normally look a uniform silvery colour behind the green but you can see the corrosion as a sort of crazing pattern of discolouration on the tracks.
Inspect for discoloured areas and use multimeter to measure resistance between connected pads. Don't measure continuity because even if the trace is good it will measure ~50ohms. If it measures a lot more than that or open circuit, then the trace is damaged inside.
You can repair by slicing out the rotten section and making new traces from foil using insulating tape as a new backing for the cut area. It's very hard to remake the connection because you can't solder and you have to scrape through to a good bit of track without damaging it. I made it work on an area with three bad tracks but next time I would sooner shoot myself . . . er, I mean spend the £20. Not recommended!
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