JD 2320 Safety switch won't allow to crank w/mid pro selected

[decarls]

Hey guys, new to the forum. I purchased a used 2320 with 700 hours on it last fall. To say the least I got screwed. While tilling in the fall the rear pto stopped working...after opening it up and finding the JB Weld where the bearing used to be I took it to an actual JD mechanic. One transmission housing later and a couple thousand dollars later everything seemed fine till I put the mower deck on a couple nights ago. When the PTO selector is in either mid PTO or mid/rear PTO the tractor will not crank over. If the selector is in the rear PTO only spot it cranks fine and there's no issue. I called the mechanic that helped me get the tractor back working and he's working with me to find a solution but I thought I'd do my part to research as well.

Thanks everyone for any help you can pass my way!!