Hello all. I'm a first time poster here with a problem from my Circuits 1 class that has stumped me all day. Please forgive me for any improper protocol or such. Part b is what I am stuck on. My first instinct is telling me that R3 has shorted (indicated by the increase in current). I have considered R1 being shorted/open and R2 being open (and honestly I think I'm missing something) but I don't think that's the right answer. Please disregard my redrawn circuit on the right. Thanks for any help in advance.