easy fix.
get a new shutter module installed by service people (pricey!)
OR
remove battery, take back off (the flash mount has hidden screws under the springy thing) , remove processing board, remove sensor board and you have access to remove the shutter module.
respect the fragile flex connectors!!
my shutter jammed mysteriously, but was able to power the motor externally with a 3volt lithium cell, it went through a few cycles and returned to the closed state replaced it and all was well again. probably my battery was low or other and the syncronization went out, leaving it in an unknown state for the processor to detect.. once that happens it never gets powered again,leaving the camera as good as a brick.
.