When you talk of odds, you need to think 744/RR, this one has a long history of Rev probs, both Ind and operation, the 744/GE/PW have few problems.
Extract from Boeing SRB Bulletin issued today:
The GE and PW configurations differ from the R-R in that they use the thrust reverser auto restow sensor signal rather than the thrust reverser unstow sensor to automatically retract the LE flaps. Thus, for GE and PW configurations, the Group A LE Flaps will automatically retract if the aircraft is on the ground and either reverse thrust is selected via the reverse thrust levers of both outboard or both inboard engines or an auto-restow signal is received from both outboard or both inboard engines.
While the rate of auto-restow events on the GE and PW engines is lower than the rate of unstow indications on the R-R engines, and no dual auto-restow events are known to have occurred, the Boeing SRB determined that the result of a dual symmetric auto-restow event is a safety issue and a safety SRP was initiated for both engine types. The Ref /C/ and /D/ SRPs were initiated for the PW and GE engines respectively. We are planning to hold technical teleconferences within the next two weeks to further discuss the Boeing SRB decision and answer any operator questions. Additional information on these telecons will be provided via follow-on communication. Further updates will also be provided in the Ref /B/ Fleet Team Digest article.