The most simple method that will not skew your profit margin results consists of:

Make the following invoice at $0:

• JR    Replace Alternator - 1 hour, with a sales prices of $70/hr. for the technician who performed the return.
• JR    Replace Alternator Warranty - 1 hour, with a sales prices of $70/hr. for the technician who performed the initial work.

Otherwise, the warranty work will penalize the person who performed the return.