A. Probing :-
May I know whether the sound is coming when the jar is put in the mixer or the sound is coming without the jar ?
May I know since when you are facing this issue?
B. Trouble Shooting :-
If the noise issue is coming after putting the jar on the mixer.
Step 1- Request the customer to put another jar and see if the sound is still coming from the mixer or not.
Step 2- If the sound is not coming after installing the second jar, then provide a new jar of the size of the jar with which the sound is coming to the customer.
If the noise is coming from the mixer with the jar attached and without the jar, then it is a motor issue- Then assist customer by the tech assistance.
C. Handling :-