More formal:
* Comprehensive inspection and maintenance
* Thorough assessment and restoration
* Complete evaluation and refurbishment
* Full diagnostic and repair service
* Routine maintenance and overhaul
More informal:
* Checkup and fix-up
* Tune-up and repair
* Service and repair
* Inspection and maintenance
The best choice will depend on the specific context and the intended audience. For example, you might use "comprehensive inspection and maintenance" in a formal report, while "checkup and fix-up" might be more appropriate in a casual conversation.