Thanks for this write up!!!
I to had the same issue with the driver side seat heater. I needed to clean and condition the leather and also clean out and vacuum under the seats anyways so i tackled this today.
BOTH pink and blue wires were completely broke off about 3/16" from the back heating element. It was tricky to soldier them back together, but i got it!
And as an added bonus: $0.67 was recovered in the process!!