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Philips Saeco SM7580 shorted parts

Hi, 

My coffee machine got broken and it looks like Q1 and U7 chips are shorted. I can find Q1 replacement but U7 SMD marking code is L16. It looks like it should be PNP transistor but I am not sure. 
Does anyone know what this component might be?. I think it's in zero-corssing detection circuit, it's located next to cement power resistor.

Thanks for help

Comments
MM
MM picture

It looks like U7 is TL437 voltage regulator

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