Probably one of the 'coils' (black boxes) on the circuit board
Remove cover.turn fridge back on and lightly touch each one with finger tip to feel which one is buzzing
That is an OLD style circuit board and has probably been sitting on store shelf/supply bin for long time
Shouldn't be a real issue as many electronic devices BUZZ
Is it time for your medication or mine?
2007 DODGE 3500 QC SRW 5.9L CTD In-Bed 'quiet gen'
2007 HitchHiker II 32.5 UKTG 2000W Xantex Inverter
US NAVY------USS Decatur DDG31