I asked about a TSB covering squeaking brakes at my 30K service. The Service Manager said yes, and had the pads and shims replaced, cleaned and lubricated the caliper slides. My squeak on backing up is gone. I'm guessing there is a different compound in the new pads.

One change I noticed is the transition from regen to hydraulic braking ( around 5 or 6 miles per hour ) is smoother when coming to a stop now.