Many time, our techs would end up inspecting a vehicle for a problem with shocks, brakes, etc., that the owner claimed LS told them they needed. We found that the repairs were not needed at all.
Two weeks after I got out of the USAF (actually while still on 30 days "terminal leave") I went to work for Texas Instruments' Computer Systems Division as a "mini-computer" Field Service Engineer. Over 95% of my clients were covered under nationwide reseller contracts. My personal goals were to get a Client back up and running as quickly as possible (downtime=$$$$ to Clients), that they were satisfied with the result, and keeping costs as low as possible for my employer and the Client. I almost never had to worry about (up)selling equipment, parts, labor, or service contracts. My performance was rated on fixing problems the first time on-site, that there were no reoccurrences of problems (even other problems on other equipment I hadn't worked on) within 30 days (recalls), the number of calls I could complete (including problems fixed over the phone without a site visit
and no recalls), and Client Satisfaction surveys.
13 years later TI sold its CSD and I found myself working in the computer service department of a local "office systems" reseller.
A major component of my performance reviews was (up)selling parts, services, and service contracts. I hated that job.
After two years I found an in-house operations position in a multi-state company's IT division where the goals were more like they were at TI. I was able to retire after 23 years there.