Generally no, although TUL
has been known to do some limited contract work for Eagle, mostly component maintenance on the Embraers.
Eagle's fleet is maintained primarily in two bases -- Abilene, Texas and Marquette, Michigan. Abilene, which is actually a wholly-owned subsidiary called Eagle Aviation Services, handles Embraer/Bombardier/SAAB heavy maintenance, while Marquette does all the work on the ATRs and also other Embraer work.
Yep, SAABs are done in ABI
(Eagle Aviation Services) also does all of the initial mod work on the Embraers when they are delivered from Brazil. They fly from Brazil to usually St. Maarten, and then Fort Lauderdale, and then Abilene, where Eagle fits them out with the leather seats, cabin interiors, etc. That hasn't happened in a while, though, as Eagle hasn't taken delivery of a new Embraer since last year.