It looks like you may need a new sink since the leak appears to be part of the original mounting fixture.
You might try caulking the perimeter of the black mount with sealant to see if you can stop the leak. There shouldn't be much pressure on this joint.
I have never seen 150 amp home service. 200 amp is fairly common today. 100 amp isn't installed much anymore. I'm a retired electrician but you should be able to get help with 200 from your local electrician.
Chop
