I will break it down
1st) Ignore sequence.
On event begin play. Set your Pitch (New Var)/ Yaw (New var0) / Roll (New Var1) of the mesh into their own Variables.
As I said I am using event tick, but this could be a function or a custom event.
Get 3 random float in range (I did use integers, but I would change them to floats) , I used -5 to +5. Then I add these to the variables you set off begin event play (New var/ New var0 / New var1).
Make a rot of that and then set the world rotation of the mesh.
I put a .1 delay in it so it does not go completely nuts.
Hope this helps.