- the original speaker was sounding tinny (potentially water infiltration?)
- replaced the speaker, and I am only getting audio out of the earpiece speaker. - tested with the original speaker, and no audio from the original either.
- double checked everything is reassembled correctly, forced restart, still nothing.
- presumably something else broke, or was damaged during my teardown, but I'm not sure what 😅
Are you using an adapted lens? Only the kit lens or other lenses designed for the electrical connection will display the aperture setting on the LCD. I’m guessing the light meter is changing because the light level is changing, presuming your not changing any settings?
To find the correct part, I followed iFixit's "ID your Mac" prompts in the parts store, then selected the glass panel from the list of compatible parts.