Mazda MAZDA3 2014–2017 — technical service bulletin
Bulletin 09-039-17-3385 · NHTSA communication 10120387 · issued Sep 11, 2017
Technical service bulletin
communication type
Structure
component
2014–2017
model years
4
vehicle entries
Official summary
Some vehicles may exhibit paint rust/blister on the vertical surface of the trunk lid. This is caused by silica contained in snow-melting agents adhering to the trunk lid. To correct this issue, the thickness of the clear coat has been increased.
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.