Weil Mclain ignition failure

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Punxsy, PA
My older Weil Mclain Ultra 105 is giving me fits as it wants to intermittently go from 1 to 2 and back to 1 on startup failing to light, 3. Pressing the reset allows the unit to startup normally, usually. It seems to be getting worse. I've replaced the ignition electrode and do regular yearly maintenance. Not sure what to try/replace next. Any help would be appreciated.
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