
Quoting
aardvarc
Depends on the reasons WHY the landlord hasn't been maintaining. If they've just gotten lax or lazy, then a simple asking may get action. If they've been in a terrible car wreck and are in a coma, that'll require a different approach.
If the landlord has been maintaining all along, and just suddenly stopped, the history of maintenance being done by them would indicate that they accepted that responsibility, even if not spelled out in the lease.
Personally, I'd send a written request, certified mail. If no response, then you can always consider escalating things by talking to your city or county Code Enforcement office.