Here's the link for the updated TSB:
IMPORTANT: A customer complaint and statement related to start-up engine
sound must be documented on the repair order for any warranty
diagnosis and repair. Certain mechanical sounds occurring briefly
during initial engine start-up may be due to prolonged engine
shutdown or long-term storage, and may be considered normal.
Prior to engine disassembly, the customer complaint and severity of condition must be
• Inspect the engine oil level, oil quality, and oil filter service duration.
• Start the engine and once the engine has reached full operating temperature, turn
the engine off for 10 minutes.
• After 10 minutes of engine shutdown, restart the engine.
• Listen for any chain type noise that may occur briefly for several seconds
immediately upon engine start-up.
NOTE: If any start-up noise is observed, then restart engine after 10 minutes
and listen to the specific area shown below with an electronic
stethoscope (or equivalent). Repeat this several more times to confirm
the source point of the brief engine start-up sound before continuing on
to the service procedure.
NOTE: If there are no brief engine start-up sounds after repeated 10 minute
shutdown attempts, then do not perform the Service Procedure of this
TSB. The engine is operating normally. Submit Warranty claim for actual
time/straight time for inspection only.