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Ceramics almost never fail and when they do it's usually in sweep circuits where they're being whacked with several KV worth of pulses, not <300VDC and <3VAC that the IF subjects them to...
If you are concerned about the ceramic caps in the IF leaking current I gave you great advice before... Temporarily stick a cap 100X the capacitance in series. It will stop DC leakage and the series capacitance will be almost exactly the same as the original part alone.
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