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From what I could find, there is types with and without preamplifiers built in.
Removed from circuit to check if there were marking on the belly, but found only embossed 'PF' on the plastic.
It is 10 pin surface mount, about 4mm x 4mm. It is supposed to be called 'quadrant photo diode' ¿?
Looking for its data sheet or from similar devices... 8-O Magicians around please ?
It is healthy with no need to replace but canibalizing for other application.