It looks like the AD has you check that the fire handle can be pulled, but does not require you to try to rotate it. It seems like it would be useful to disable the "FIRE EXT BOTTLE" breakers and attempt to rotate the handle as well, if the concern is trying to detect internal damage that would prevent the fire handle from being operated in an emergency.
http://rgl.faa.gov/Regulatory_and_Gu...2019-02-03.pdf