I don't know how many of us might be affected by the potential ECi cylinder
AD, but here is an interesting article by Mike Busch, a pilot, A&P, and
owner of Savvy Aviator, Inc., which among other things manages the maintenance
on many Cirrus airplanes. He makes a good case that replacing the
cylinders would likely do more harm than good.
With the permission of the author, it is attached to this email.
Dennis
Legacy 640 hours on an IO-550 EXP