I would suggest a wrap repair if you have decent access, on top of what the previous two posters suggested which are good ideas.
I've never needed to use something like this but there are a variety of similar products on the market and I am pretty sure they would do the job nicely.
https://www.fernco.ca/plumbing/pow-r-repair/pow-r-wrap
When I was into RC, i fixed an cracked abs body by using some fabric and ABS cement as my resin and it worked like a charm.