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Dead voltage reg on Magnum FC

I have an emax hawk 5 (Magnum stack) and after it fell out of the sky today I realised the Board wasn’t booting up. The ESC was outputting Vbatt but a multimeter on the 5v outputs on the FC showed only 1.5v. When plugging in the USB, everything booted normally. I’m guessing I have a dead voltage regulator.... is it repairable? How can I identify which component is the problem? There is no physical damage.