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Just had my speaker start saying the mic was muted when I hadn't touched the switch and it is set to ON. Flipping the switch back and forth only very temporarily helped. Took the bottom off per this guide to get access to the switch. Found even with the switch set to mic ON, there was ~1kΩ between the two pins that should be open circuit. Popped the metal cover of the switch itself off and found dendrite growth between the two terminals. Cleaned with isopropyl alcohol (rubbing alcohol) to remove build-up, added a small dab of dielectric grease (not necessary), and now 100% back to normal (full open circuit as expected). Thanks again iFixit!
If you're able to solder, you can find micro USB ports on Digi-Key.
Forgot to confirm the pin count while mine was taken apart, but would bet it's similar to many common ports such as PN: 10118194-0001LF