Dash rattle after A/C odor TSB being done

[hmk123]

Had intermittent musty odor coming out from the vents. So I finally brought it in for the TSB before the warranty expires. I had forgotten that they need to get to it from the inside of the car. Well got it back and took it for a ride. Now I have a rattle coming from the passenger side dash. Haven't quite located the exact position. But it seems like somewhere around the A-pillar. Will probably take it back tomorrow. Anyone have an idea what most likely is the cause when they put the dash back together? Before the TSB work I am pretty sure didn't have a rattle there.
Thanks!

[CHARGERTREV]

Im guessing dash speaker, pull the grille thats by the windshield off and see if you can find it.