I think that you are in the early phase of an internal IMS bearing failure. It won't be long before you throw a flashing CEL and will need to be shut down to prevent permanent damage.
No need to go under the knife to replace the bearing, simply get an IMS Guardian now and wear it under your clothes. No one will be the wiser.
If you do get an alarm, then skip the PA, you'll need serious help from Jake for repairs.
