We have learned that lesson too. Even for something as routine as an oil change or lube job, check to see the job was done right before leaving.
This is especially important in expediting as the freight takes us all over and we are never quite sure when we will be back near the vendor that messed up.
Examples:
Strange pieces of debris spotted inside the fuel water separater after the filter was changed. I spotted this before leaving and the dealer immediately fixed it.
On dual wheels, a tire valve stem not installed in the correct position relative to the other one when the tire was repaired. No big deal, but if I had caught it early, it could have been fixed then.
A lift gate that stopped working after the truck batteries were replaced. The mechanic forgot to reconnect the wire that powered the lift gate. I should have tried all electric components before leaving the dealer. The unconnected wire was discovered a few days later at a shipper when we needed the lift gate. Fortunately, I was able to put two and two together, locate the disconnected wire and quickly make the repair. But had I checked the lift gate after the battery replacement, I would not have had to.
After you have been waiting on a truck repair or service for a while, the desire is strong to leave the shop when they say the truck is ready. And you really, really want to believe the repair or service was done right and you can drive down the road trouble free.
We have learned to resist those urges and throroughly check everything that we think might relate to the repair before we leave. It is a shame we have to do this, but we do.