Yep, I had this for about a month or so. 2013 leaf with 34300 miles on the clock. Here is what I wrote to the service advisor:
"Unusual Leaf driveline noise is heard during normal driving in stop-and-go traffic It happens often but not every time on braking and acceleration. However, there’s a reliable way to reproduce the noise without moving the car:
Place foot on brake and press start
Roll down driver window.
With foot on brake, place shifter in “D”
(The distinctive “click” as transaxle shifts into gear is NOT the noise were investigating)
Place LEFT foot on brake, press hard and leave it there for remaining steps.
Place Right foot on accelerator, press and then release.
Move shifter to “R”
Press accelerator and then release
Move shifter back to “D”
Press accelerator then release.
Repeat steps 6,7,8,9 as many times as desired.
Each time the accelerator is pressed, a disturbing “thunk” is heard through the car."
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And, here's what I got back today on the service order. I paid for 30,000 mile service, but they didn't charge me for this repair, even though the car has passed the 36 month anniversary of original purchase.
CUSTOMER STATES THERE IS A CLICKING NOISE PRESENT WHEN SWITCHING FROM DRIVE TO REVERSE AND ACCELERATION. TEST DROVE VEHICLE AND VERIFIED CONCERN. CHECKED FOR TSB AND FOUNT NTB12-055E CLICKING NOISE DURING TAKEOFF AND ACCELERATION. RE-GREASED BOTH AXLE SPLINES PER BULLETIN. ALSO NOTICED THAT THE FRONT BRAKE PADS WERE DRY AND THE PADS WERE SHIFTING WHILE SWITCHING FROM DRIVE TO REVERSE. REGREASED BOTH FRONT BRAKE PADS. CLICKING NOISE IS NO LONGER PRESENT.
So it was either cv axle splines, sticky ungreased brake pads, or a combination of both. But it made the car sound like it was falling apart, so I'm glad it's gone.