one slow leaking rear SS brake line help

[newtonova822]

Guys,

Had my car at dealer yesterday for a broken glove box in warranty. But they found a leak on one of the after market stainless steel brake lines. They would not even offer to do an 1/8 -1/4 turn of the fitting. Just $400 to put stock back on.

I bought chinese wrenches for the job but they were poor. Not sure if I should snap on or matco to torque slighly more. They have been on 6 months and about 2k miles. I am asking if I can get one replacement from the aftermarket company in case can't be stopped/tightened.

Any suggestions for what to do?

I did not look yet to see which fitting is leaking. One it has been terrible cold here then back to 30 to 50s. maybe that break it free slightly.