So let's take a look at e.g. email. Your team will have a set of SLAs... and one of them may be 48 hours for a response, as an example. Your team would be looking at ensuring the response process is robust, so you conduct an
FMEA to check for possible weaknesses in the process, and the appropriate actions to address them.
Your
SIPOC will be something like this:
Supplier:
A,B,C
Inputs:
Customer emails question
Process:
Customer Service finds answer to question
Output:
Customer Service emails response to the question
Customer:
X, Y, Z
Some of the failure modes that could happen for this particular process are:
Respond with the wrong answer
Respond after 48 hours
Fail to respond at all
Respond to the wrong email address
Then as usual, do a fishbone for a cause and effect for each failure mode.
This would be enough to get you started with the exercise.
HTH