I am totally finishing my basement (seven rooms) including installing a
bathroom. I want to be able to say I did it all myself. I have installed
about 50' of half inch copper with seven stopvalves and about 25 joints
(straight, T's and L bends). I used presoldered joints. With some
trepidation I opened the hot and cold stopvalves and found that just one of
the L joints had a very slight leak. The whole system is not an artistic
success but it is functional (except for the leak). The L joint is about 2"
from one wall and 3" from another (it is in a corner) so that seeing behind
the joint is not easy.

How should I deal with this? I know I have to drain the water from that
part of the system. Do I need to remove the L joint and replace it? Would it
be possible to apply flux to the two pipes and then add extra solder?

Would appreciate any suggestions.

Peter.