There may be a bit of a problem that unless you did a formal surrender of your unit on Jan 2d that your lease ended on Jan 31. So if the lease ended on Jan 31 and were sent an accounting by Feb 27 then its likely "timely"==my guess is date of mailing counts--or LL get at least that benefit....
What you fixed out of own pocket is not relevant.
The issue tome would be the practical problems of making valid service on you in NV if you know how to duck it and the almost slam dunk ease of a tenant to appeal a DJ decision and force it to Common Pleas.
I don't blame guy for trying. Its not his attorneys job to explain downsides--I'm sure LL knows those already.
5 years left of carpet life --LL is coy--how old were they to start?
Hey, I could get creative too-----
Aside, how long were you there?
What City? (LL's in some PA Cities are notorious for not getting permits--and lack of permit can be a big problem as to rent collection.)