Frankfurt here. This is why I keep telling my old colleagues: the shipping cage is part of the redundancy plan. Leaseweb Frankfurt has the same Delta PSUs in their rental stock, but the turnaround on a cold spare during a heat event is 4-6 hours if you're lucky.
I read tickets for a living now. The number of "urgent" colo clients who keep zero spares on site and then act surprised when SLA means "we start driving" not "we teleport" is depressing.
Your 72 hours is exceptional. Most facilities in DE would have hit thermal shutdown on the chillers at 35C ambient, never mind 45C.