I'm a noob at pin repair but have been doing bench repairs/ service to varied ewuipment for a long time. I'm sure other techs with more pin experience have given good advice.
Reseating board connectors has worked in the last three pins I've seen with resetting issues.

This work is also done when replacing bridge rectifiers.

I agree with Mike, lead free solder is problematic and I just don't seem to get off on the fumes as much! ;-) Z