Clearly, you've never been Landlord-Tenant Court in New York City.
ALL the Landlord has to assert is that he gave Tenant a perfectly functioning toilet
on day-1 of the Lease. If it was not so, then the Lease would not have been signed,
or, there would have been a provision in the Lease to fix it, or some other stipulation
with regard to a broken toilet.
So the Landlord can simply say Tenant broke the toilet.
It then falls onto the Tenant to prove otherwise.
And my point is: DOCUMENT.
Then Tenant stands on firm ground.
Otherwise its Landlord's word against Tenant and without strong proof FOR the Tenant,
the Court will uphold Landlord's claim that when Tenant took occupancy of the premises
the toilet was 100% perfect, that Tenant had inspected premises prior to taking occupancy
and had not noted anything malfunctioning or untoward.
Court will hold for Landlord and against Tenant.
Case closed.
Tenant loses security deposit.
You need to find a legal forum. The plumbing part has been handled.
Glad to have helped