I am looking for recommendations of good Cessna 421 Shops in the
vicinity of Wisconsin (within a 300 nm radius od KISW would be nice).
Does anyone have any positive experiences to share? By "421 shop", I
mean a shop that has significant experience maintaining 421's and
preferably one where someone at the shop is qualified to test fly it
after maintenance.

-Sami Saydjari
Cessna 421C
N5554G