Transmission shifting problem

My 97 will shift manually from 2 to 3 only and 1 and 4 don't work. Reverse works. I have Codes P0753,P0758,P0785,P1860,P0740. I have power in and out of fuse 24, so the problem is from the fuse box power wire to the group of solenoids powered by this line. Can anyone help me with the next steps to take? I believe I must have a damaged wire to or in the tranny, or bad/corroded connectors. Your thoughts and advice would be appreciated.
Thanks

Make sure the big plug on the trans is well seated and not corroded for starters, ign switches were an issue in this year also.

I understand the ignition switch would cause problems before the fuse, but if power is fine up to and through the fuse the problem is from fuse to tranny. Do you know where the big plug is located?...I haven't look for it yet.