I recently had some work done on my car by a mobile mechanic, he had to replace the serpentine drive belt that powers the water pump, alternator and air conditioning. The old belt tore itself to bits suddenly some 40km from home, so the car was undrivable and had to be towed back home.
He also had to replace the belt's tensioning pulley as it was wobbling from side to side because of worn bushings. I got him to do a 10,000 km service as that was due, one of the items that needed replacing was a dusty air cleaner filter. He wasn't able to source a replacement pulley that day so he arranged to come back 6 days later.
I noticed after this service that there was excessive induction noice under acceleration and when he returned to fit the new pulley I noticed two of the five spring clips holding the air cleaner cover in place had worked loose. Once reattached, the excessive induction noise was gone.