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Central heating manifold spindle is not moving, suspect diaphragm shot, but can anyone tell me what boiler action should push it out, its stuck in the closed position (fully retracted) and boiler appears to be operating normally ??? What event can do to check its normal actuation?

Hi all, had this cracking boiler 18 yrs from new. Regularly BG serviced by mature but now retired old chap (according to the fresh faced lad that turned up). In the last two years had a new 3way diverted valve, DHW manifold, DHW stat, Fan, gas valve and PCB. So here's the possible problem...