have 234,000 mi ,no trans.,odor ,fluid looks good,trans . shifting not as it show

waiting for response from yesterday,s question

got no response

have p1618 faujt in lead between aw 50-52 and motronic 4.3 (MIL Resquested) andp0751 shift solenoid a performance or stuck off which is giving me a check engine light,Would like to make repairs myself but have no idea where tp start.Help please !!!!

err ansor codes fault in lead between aw-50-52 andmotronic 4.3(mil resquested) andshift solenoid a performance or stuck off remedy please