Don't need the SOM to do it at my building. Our mechanics can just lock out the sorter if they have to replace a wedge. Sometimes they can just reset the error code if the wedge didn't get physically damaged and it starts working again as normal.
Replacing a wedge doesn't take that long, usually a UA will take the scissor lift down under the problem wedge while a mechanic tries to reset it first. So if it needs replaced a mech can just drive down and the scissor lift is waiting for them. Actually swapping out the wedge for a good one usually takes under 5 minutes once the sorter is locked out.