Successful MacBook Pro right speaker replacement using iFixit replacement
Rights speaker developed distortion...sounded like a perforated speaker cone...
Straightforward but fairly lengthy mainly due to logic board removal
Have right tools (pentalobe, torx screwdrivers, spudger assortment)
Use air duster throughout to clean out dust from fans and between board
layers as you go...also isopropyl alcohol on Q tip here and there.
The advice about avoiding trapped connectors when replacing logic board
was well heeded but even so careful checks needed.
Useful tools - pentalobe screwdriver, torx screwdrivers, iFixit magnetic parts mat, binocular magnifier
clip-on for spectacles (purchased years ago from Tokyo Hans store in Akihabara district, Tokyo)