1997 Jimmy error codes

I just purchased this vehicle this weekend the guy I bought it from says he just had the transmission rebuilt and I see no problem shifting. He did say that the check engine light was on cause of an o2 censor which is true but that is not the only problem.

My question is about the other error codees. There are a couple and then a repeat code for each one. They are Po 155,740,753,758,1860. The first one is the o2 censor. The rest are a couple differant solenoids. I think I might be able to do this myself but if the transmission was just rebuilt shouldn't all of the solenoids be working properly. The guy did say it was shifting into nuetral and he replaced the neutral safety switch does that matter.