I cannot do this for historical records without a sql script off the top of my head. For future you need to add a relationship to the Employee Object. Then you can call any fields from the Employee object, this is due ot the way the frs_compositecontract object work.
- Add a new link field to ServiceReq - CustomerEmployeeLink (Link)
- Add a new relationship to the Employee object using your new field in a 0..N:0..1 (Zero or many to zero or one) cardinality
- Update the existing profile link relationship ServiceReqAssociatedCustomer so the ProfileLink_RecId is copied to your new field CustomerEmployeeLink
When a customer is linked it will also create a new link relationship to the employee object, now you can use this in a saved search.
For existing records you could run an SQL script to copy the ProfileLink_RecId to the CustomerEmployeeLink_RecId field. (backup database first)
Set CustomerEmployeeLink_RecId = ProfileLink_RecId
Obviously check field names etc in the first instance.