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About the capacitor a polyester 1.5uF 600 V is OK, but should preferably be of cylindric shape with axial leads and should be firmly attached in the box.
But the replacement of C8 should be considered only if it is either open or short-circuited. Did you check this ? Did you check the voltage between D7/C8 and ground ? (about 460 V DC).
The operation of the Schmidt trigger (T2 and T3) should be checked, but this is impossible without an oscilloscope.
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