Yes there was a spar AD on the TB. One of the things one would check if buying one, but then every plane ever made has a list of ADs as long as your arm anyway... Some even longer
Englishal - are you sure the TB10 does
more MPG than the TB20? I am not so sure. It drinks more but it goes a lot faster. I get the same MPG now as I used to get in a PA28 Archer, but I am moving a helluva lot faster. Fixed gear comes with a heavy price tag in fuel flow. The TB20 does the same MPG as a Cirrus SR22.