How do I find the part number for this refrigerator?

I have a Whirlpool WRS325FDAM04 refrigerator whose 3 LEDs lights are all
flickering (for years) and I want to surprise fix it for my wife's birthday
coming up.

I think I need to replace the main 120VAC LED control module at the top of
the refrigerator in the front of the roof which I think also is wired in
series to two other LED lights, one of which is in the back behind the
refrigerator crisper and the other of which is in the back of the freezer
down low.

I just want to make sure I get the right part numbers, specifically for the
control module but also for the LED lights as I don't know which is busted.

Where can I look up the right part numbers for the three modules to be
sure?