While I did show photos of the broken pins, I'm guessing you did not see them. No cleaning is going to help this meter.
I did read the thread, in part it was a response to what daisizhou said. I was pointing out soldering pins would more likely exacerbate a contamination problem should it exist, rather than directly cause it.
The integrated holsters and low set sockets near the bottom edge on the Fluke 189 aren't my favorite features. Here are some high res photos of the legitimate ones. I'm leaning towards your replacements being chinese knockoffs.
Could be a problem with too flexible sockets when non shrouded banana plugs are used. Less rigidity to prevent the internal contacts moving and transfer stress to solder joint or pin at the pcb.
Cleaning requires great care,I always stress the need for a practical syringe to flush the bottom,and needs to be soaked in ethanol.
Many people don’t understand what I say, so they will fail.
I have a 187 myself, and this is how I repair it.
When I have time I will shoot a video, maybe it will make everyone understand better