My brother is wondering if this means it needs rebuilt. He said he was driving it for about 30 minutes and it started acting like it hit neutral. Now he puts it in gear and it acts like its slipping really bad. Will barely roll. Plenty of fluid so I told him pull the pan and check it out. Metal all over the filter, fluid is glittery, and smells and looks burnt. Has 4 codes; 37,45,23, and 62. All to do with electronics. I told him it needs rebuilt but he wanted me to ask. It's a 1997 2500 12 valve 47re around 150,000 miles and trans supposedly rebuilt around 30,000 ago. Opinions please? Thanks