Is your car a 2013? Per NHTSA's vehicle recalls page, the 2013 Leaf lists two "recalls", both for the passenger airbag. What your service tech is referring to is likely a Technical Service Bulletin, or TSB, of which 10 have been reported to NHTSA on the 2013 model. One of them is clearly not for the Leaf:
CERTAIN VEHICLES WOULD DISPLAY, IN THE INSTRUMENT CLUSTER, A WARNING LIGHT ILLUMINATION OF A LOOSE FUEL CAP WARNING. MODEL YEARS 2012-2014. NO MODELS LISTED.
Do you know which TSB was applied? It should state on your paperwork what the service bulletin number or NHTSA ID number is.
Blue Ocean 2012 Leaf SV, lost that 1st bar at 34 months/26,435 miles. Lease returned 2 months later. Final LeafStat figures: 225 Gids, 17.44 kWH, SOC 91.89%, SOH 82.36%, 69.49% HX, 54.57 Ahr, battery temp 61.8 F.
Now driving a 2015 VW eGolf SEL.