If you would like to notify your tenants about upcoming maintenance, here is a sample template you can use to write a tenant notification letter for maintenance.
To,
[Tenant name]
Dear, [Tenant name]
It is time for our regular maintenance procedure. I request you to cooperate for the duration of this event. You may communicate any specific problems you face regarding the functioning of your apartment.
This will occur on [Date] at [Time]. Cooperation is requested as this procedure is necessary.
Sincerely,
[Your name]