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It shouldn’t be a difficult fix for you to find the leak if you’re comfortable taking it apart, but if it’s a poor install then as you say get it sorted for free.
You’ll need a big enough adjustable to get it apart and a joint sealant and silicone sealant to get it all back together.
I’d check the right type of waste was used for your sink - there’s slotted and un-
slotted, the former will leak for fun if it doesn’t match your overflow. And check that the right size gasket was used.There’s nothing complex there. Both joins you point too need to be slathered in Plumbers Mait or preferably LSX to make them watertight.
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Top one doesn't look square to the sink and bottom one looks cross-threaded but that could be the photo angle. I'd reseat the bottom one at least.
Is that water or some kind of goop all over everything?In my experience (4 sinks, more than 4 attempts to seal!), sealant isn't required if everything is new and installed well but PTFE tape helps on plastic/metal interfaces. That does not look installed well! Your isolator valve is half shut too if you didn't do that!
I have a leak, in two places underneath a newly installed sink.
Obviously I'll get the plumber back in, but in the meantime, should I tighten or loosen any of these parts?
Leaks are at the two red arrows.
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