Do you have standard diagnostics and troubleshooting procedures that lead logically to repair recommendations? If not, you’re relying on custom troubleshooting. When custom troubleshooting can’t be avoided, a tech with formal training in troubleshooting can efficiently determine what’s wrong and probably figure out how to fix it.
For critical equipment, relying on custom troubleshooting leaves too much to chance. It’s unlikely your ace tech(s) will always be