"If in doubt, cut it out".
I think various sources recommend 6" along the grain and 4" across it. Cut back to good wood, soak that in a fungicide, pref. not water based, then replace the wood, and cover in lots of paint - remember to not skimp on the undercoat. By using a petroleum spirit based fungicide, the enamel primers and top coat will bond into the new wood better.
-------------------- "Let Joy be unconfined!"
I'll get her chastity belt keys, then..
http://www.linesquall.co.uk
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