UPVC Window frame peeling ?

UPVC Window frame peeling ?

UPVC Window frame peeling ?

Hi group, we have a terraced house which we have rented out for a while now, our tenants are leaving so we've decided to sell. I haven't been in it for four years but today whilst visiting we noticed the front window frame has blistered. Does anyone know if this can be repaired, and is it a specialized task

. See attached photo.
Thanks, & Merry Christmas.

by ottosump

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