Yes, maintains is a Scrabble word!

Verb

1. Keep in a certain state, position, or activity; e.g., "keep clean"

2. Keep in safety and protect from harm, decay, loss, or destruction

3. Supply with necessities and support

4. State categorically

5. Have and exercise

6. Maintain for use and service

7. Maintain by writing regular records

8. State or assert

9. Support against an opponent

10. Stick to correctly or closely