Markous

Car is a 1998 Civic Dx. Got into car on Saturday night and d4 light was flashing on dash, engine light went on. I had no power driving in d4, however I could shift from D2 to D3 but was very hard shifting. Next time went to get into to get it home it shifted very hard into reverse then into D2. So looked into codes and it threw a P0700, P1768, P0135, and P0141. Looked into P1768 and found to replace linear solenoid(replaced Monday part from scrapyard) Has been fine for me all week until today when I got in after picking up oil and light was flashing again with same symptoms and running same codes. Is my ECM bad? Is the new solenoid bad? I was thinking ECM being that it's also throwing the heater circuit codes. HELP