It wasn't leeneia's to check / repair. But the more we learn about what might go wrong the more likely we are to cope better next time something does.
Anyway it's fun to swap horror stories.
My best was the gig where my radio mike started misbehaving and a sound man appeared to tell us that in another part of the venue my voice was coming out of Gerry Marsden's guitar amp. So my claim to fame is calling with Gerry and the Pacemakers. Their sound man offered to lend us a plug-in mike but ours smugly told him that we had a spare on a different frequency.