Been a while since I posted but was just fixing a church member's headphone and documented it via this How To. I also cover how to (timestamps in TOC below):
find pin out of replacement jack (I used this but any other TRS jack should work: https://www.amazon.com/gp/product/B07...)
find pin out of headphone cable to determine Left, Right & Ground cables
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TOC
Intro - 0:00
Replacement jack - 0:16
Tools Required - 0:24
STEP 1 - determine pin out of your headphone cable - 0:38
STEP 2 - determine pin out of replacement jack - 1:15
STEP 3 - cut existing jack, route new jack/heat shrink - 2:23
STEP 4 - strip cable sleeve - 3:39
STEP 5 - strip wires (L,R,G) and determine pin out - 4:10
STEP 6 - mount it - 6:30
STEP 7 - check it - 8:11
STEP 8 - solder it - 8:38
STEP 9 - clamp it - 10:31
STEP 10 - shrink it - 11:13
STEP 11 - twist it - 11:59