Sink plumping leaks

#1
When they made my unit, it seems they did not brace the the roof vent line which runs to the sink drain and then down to the holding tank. I have a number of leaks at the joints and wondered if there is a better way of fixing it than using tub silicone caulking. I can't get at it to replace the pipes because of limited space.

Any help :dead: :angry: :question:
 
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