Success. I needed to replace the right speaker. I thought I was ready at step 22 (you are able to replace the left speaker at this point… but but the right) To replace the right I continued thru step 29 but didn’t completely remove the motherboard. I just lifted it enough to remove and replace the right speaker cable.
Read all of the comments and solved many problems. Thanks to I-fixit, Walter Galen and all who posted comments.
Will Brecht - 03/02/2019