Looks like it. That's about as far as they got though thank goodness. No rodent urine corrosion to deal with.
Moving on to the bleeder resistor board. It's warper and cracked. Seems they added a ceramic standoff during the "B" upgrade which put stress on the board.
You can see the two holes where it used to have a metal support like on the other side
I'll fabricate replica dogbones using
this technique and repair/replace the phenolic board