During an end of lease return check there might well be additional work requests from the lessor.
When an aircraft is leased to a lessee from the lessor it is provided in a certain configuration and to a standard. Ultimately this scenario is replicated at the lease hand back when the aircraft is returned.
The lessor is interested in maintaining the asset value and always having a marketable asset, in many cases one aircraft will be transitioned from one lessee directly to another.