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dpb

wrote:
....

1. is there some liquid I can place over repair that would help to detect
pinhole leak?

dilute some liquid soap/detergent a little...

2. if there is still leak how can I solder so as to build up solder on edge
and make better connection?

Heat the fitting (not the pipe) just behind the entrance and simply flow
solder into the joint. It'll fill fully. Touch the solder at the rear
or area where you don't have direct access and get it to flow from there
so you're ensured of being hot all around.

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