Answer: Step 21 - EV2 move to installation point for right lower strut.


The list of steps in the corresponding spacewalk mission:
Step 1 - EV1 & EV2 exit airlock with structure bags.
Step 2 - EV2 move to P1 and install anchor hooks for safety tether.
Step 3 - EV1 & EV2 move to P6.
Step 4 - EV1 & EV2 install respective bags on worksites.
Step 5 - EV1 move back inboard.
Step 6 - EV1 retreive portable foot restraint with extension.
Step 7 - EV1 return to P6.
Step 8 - EV1 set up portable foot restraint.
Step 9 - EV1 move to structure bag.
Step 10 - EV1 & EV2 build "upper triangle" .
Step 11 - EV1 enter portable foot restraint.
Step 12 - EV2 hand upper triangle to EV1.
Step 13 - EV1 install upper triangle on mast canister.
Step 14 - EV1 reposition foot restraint.
Step 15 - EV2 hand mid strut to EV1. EV1 installs on body tether.
Step 16 - EV1 & EV2 install left lower strut.
Step 17 - EV1 & EV2 install mid strut on left side of mast canister.
Step 18 - EV1 reposition foot restraint.
Step 19 - EV1 attach mid strut to body tether and enter foot restraint.
Step 20 - EV1 receive right lower strut.
Step 21 - EV2 move to installation point for right lower strut.
Step 22 - EV1 & EV2 install mid strut on right side of mast canister.
Step 23 - EV1 & EV2 install mid strut.
Step 24 - EV1 & EV2 install thermal blanket and verify pit pins are in place.
Step 25 - EV1 & EV1 grab tools and move to 4B work site.
Step 26 - EV1 install portable foot restraint.
Step 27 - EV1 & EV2 build "upper triangle" .
Step 28 - EV1 & EV2 pack bag with tools to bring inside.
Step 29 - EV1 & EV2 return to airlock with bag.
Step 30 - EV2 put bag in airlock and enter.
Step 31 - EV1 enter airlock and close hatch.
