How do I report on work logs?

How do I report on work logs?

Hi all,
 
Some of the requests need more than one technician to work on them. By now we send requests to a group and assign the request to a technician, when the work is done by the technician, he will add work log and change the technician to other technicians.
We need a report showing which technician works on which requests, but when technician name change to others it will not be presented in reports anymore.
Are we wrong in our request process? Could we have a report to shows work logs?

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