Yessir! A true pro.

If I may relate, I had a somewhat similar incident at a USAF base in Iraklion, Crete in 1969.

The scenario was that my old Hammond M102 was made for the UK market and ran on 220V, 50 cycles. So you can imagine my horror that the USAF base ran on 'American' power at 110V, 60 cycles (we had taken it for granted, obviously mistakenly, that the power supply would have been 'Greek', same as UK). The upshot of all this was that the generator drive shaft in the Hammond was now rotating at a different speed and in so doing, lowered the key of every song by four whole tones.

The solution? In those pre-transpose days?

I played a beat-up upright piano for the duration of the gig - four months.

The good old days, I suppose.