Maybe they didn't install the new clevis pin/yoke correctly when they did the recall. I would take it back to the dealer that did the work and have them check it and do it correctly if that is the cause.
You folks do know that there were 2 recalls on the rear brakes...they recalled the first recall to retrfit different parts again.... because the first fix didn't work, and a pebble could still lock the brake lever ... mine got toasted prior to the first recall, complete meltdown, caliper, pads and rotor all replaced undr warrantee..... after the retrofit I took a hanfull of gravel, an tossed down in the abyss over the new parts, hit the lever a couple times and it wedged up.....
Had to actually remove the assembly to get the offending pebble out and unwedge the lever.... at least with the original assembly you could slam the lever down and slide your foot off a couple times and the pebble would pop out.
The problem was, if it wedged when you hit the brake, and you took off without hitting the brake again for 3 or5 miles, the bike would start slowing down even under thrttle.... too late by that time... the rotor was glowing red by then.