Hi - my name is XXXXX XXXXX X'm a Real Estate litigation attorney here to assist you.
If you sent him a copy of the bill and informed him that you were withholding enough to cover the cost of repair, and he subsequently cashed the check, he should be out of luck to now protest.
Landlords are sophicticated enough to know that if they cash a check and don't send a letter protesting the payment, etc., they are waiving a claim that you owe more.
I think you should write the landlord outlining your actions and that he has no right to seek any additional money for this portion of the rent as you deducted it to cover the costs, and if he persists, you will sue him for the costs you incurred, which will essentially offset any claim he has.
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