You know, back when I worked on cruise ships our shoreside management team made the decision to switch our shipping from air freight to ocean freight. I told them that the entertainment department would take a major hit as soon as something breaks.
See, with air freight, parts could be overnighted to Miami then delivered to a ship within 48 hours, 72-hour total turnover in worst-case scenarios. I was the showroom automation technician. If my stuff died, the show died. If audio or lighting lost some equipment we can keep going right along. If my lifts, drops, turntable, or whatever broke we had to make severe changes to the flow of the show, dancer choreography, everything. Basically we would have to stop the show, have a meeting and decide how to best re-order the show to work around whatever was broken. When this happened with a 72-hour window it was no big deal. We'd limp to the finish line.
Well, Carnival was never keen on keeping replacement parts readily available. Sure enough after they made the change to ocean freight I lost an entire electronics cabinet (that, you know, controls the drive motors for my scenic elements) that disabled the front 1/3rd of the stage. That includes the two main curtains meant to blind the stage as well as a few other scenic elements that are integral to the shows. Shoreside's solution was to manually open the curtains and just leave them open. The Austrian curtain is basically a security door after-hours, so now we needed to have a rotating team of security constantly in the theatre keeping watch. The other curtain blocked the view of nearly the entire stage for scene changes, etc. Welp, looks like the audience is now getting a very well-lit view of every scene change. The scenic elements in question had to be removed from the shows which created some awkward shifts and scenes. Long story short, the customer reviews plummeted while we waited for our new equipment to slowly make it's way to us.
It took over a month. My point is always keep a spare. When you use that spare order another immediately.