Identify the op amp IC
It appears to be an NCV20072 or NCS20072, which is a 3MHz dual rail-to-rail output op-amp.  Datasheet: https://www.onsemi.com/pub/Collateral/NCS20071-D.PDF

For the record, this was found by searching for the string "k72" top mark op amp.  The datasheet shows that K72 is the device-specific marking, J46 is a date code (year and work week), P signifies the manufacturing location, and the dot indicates that the package is lead-free.