Have you contacted Central DS Alan?
A malfunction like this coming hot on the heels of such a major modification seems very suspicious - perhaps they might be able to shed some light on the problem.
I know member EXFSO(Peter) had some problem with his Astro 40D in the past (can't remember if it was the Err99 message though) - perhaps a PM to him might be of use too.
Good luck with it.
Doug
ps...the contacts idea above sounds like it might be worth a go
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