Modeling a Car Dealership context in an Entity-Relationship diagram
Service, inspection,  and repair are all instances of some work. If you really do need service, inspection,  and repair as separate entities, create a super-entity Work, which would have a 1..* relationship to a ticket, and make service, inspection,  and repair inherit from it (1..1). In many cases you will probably just have Work with the Type being one of service, inspection, or repair.