Vent: that weird deja vu loop with my friend's apartment key took almost a full year to figure out

Vent: A client's home LED mask gave her a weird rash

A regular came in last Tuesday with red, bumpy skin after using a cheap LED mask she bought online. She had it set on the blue light setting for 20 minutes every night to fight acne, but it clearly irritated her. I learned to always ask clients about their at-home devices during the consultation. Has anyone else seen reactions from those over-the-counter light tools?

Spent three full shifts on a single fuel pump issue

I was working on a Cummins ISX engine where the fuel pump was acting up. It took me three entire shifts to trace the problem to a tiny seal that had worn out. Every time I thought I had it, something else would leak or not seal right. How do you guys handle jobs that just keep going like this?