2.8L Duramax Customer is Upset - P20E8 Diag and Repair

Customer states service exhaust fluid system message. He went to another shop first, they diagnosed the fault as being a faulty DPF diesel particulate filter which I had just replaced for a code P2002 13,000 miles ago.
Diagnostics leads to P20E8 code and reductant DEF fluid pump replacement.
Chevy Colorado GMC Canyon
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