The NTSB yesterday recommended that FAA call for operators of Boeing 757s powered by certain Pratt & Whitney PW2037 engines to check for a condition that could lead to uncontained engine failure if not corrected. You can read all about it in my colleague Fran Fiorino's DAILY story on AWIN (subscribers only.)
After much digging today with the help of Graham Warwick, I found out that the inspection won't affect the variant of the Pratt & Whitney engines that power U.S. Air Force C-17s. Is there a physical difference between the F117 and the 2037 (or is it actually a 2040)? The F117 is actually a PW2040.
Mystery solved. You can see NTSB's letter to FAA, addressing the problem, here.