I have a 97 "R" 172, I have already been "over serviced " long story, now sorted. SIDS inspection looks like another $6 k just for the inspection. The minister of finance is starting to have issues!! She will not be happy if I get a $20k bill for SIDS ! It is confusing to say the least, and I don't have a lot of confidence in the lame ( nothing against lame's !! I think they have THE most thankless hard job in GA thanks to CASA) just that I don't want to be the " test" case for his SIDS education. My plane has been opened up 4 times in 18 months, and no, it hasn't done 400 hours.... Now it seems it all has to be done again. Anyway, I am new here... Have found these forums pretty informative.