the Movie Memphis Belle has completed two years of restoration work and the engines were fired off for some test runs... (thank you George!)

During this initial ground run, three of the aircraft’s four engines (#1, #2, and #4) were run at different power settings but the aircraft’s right-inboard engine (#3) required more work before it could be test run.

In the leadup to the engine run other work was being done to get the Belle airworthy again after its time on loan to the National Warplane Museum at Geneseo, NY from replacing a section of the wing spars to adjusting tail control cables and restoring the floorboards in the waist section.

https://vintageaviationnews.com/warbird-restorations/engine-runs-on-the-movie-memphis-belle.html