900s rear defroster switch

At some point the rear window demister switch on our '88 900s started acting up, if you push the button the defroster comes on for a few seconds then shuts itself off. If the button is held down for 30 seconds or so, then it'll stay on for the correct duration. Is the time delay circuit entirely contained in the button assembly or is there a delay relay hiding somewhere else?

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James Sweet
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