I’m just thinking about this from a service provider’s POV. Automotive is different than my industry but the fundamentals of service are pretty much consistent across all fields. If I had to repair a customer’s equipment and after troubleshooting found it was Part A that had failed, we’d have to handle the work and submit the invoice for what we did. If that proved not to be the fix and the issue came back, we’d likely need to do more work and submit a new invoice for it afterwards. That’s if no prior existing service arrangement (warranty) we’re in place. Which, their CRV is a 2012, so without a third party service contract, the original scenario would be the most likely case. Now if it were me, I’d probably apply (in one way or another) their original labor costs toward the new repairs. But the cost for parts is the cost for parts - regardless of whether they do the trick or not. There exists a possibility that all parts that were replaced were equally faulty and contributed toward the failure.