Inspect the belt for cracks or damage. If the belt is cracked or damaged, replace it.
Check that the position of the auto-tensioner indicator (A) is within the standard range (B) as shown. If it is out of the standard range, replace the drive belt.

As required by the FCC
1)This device complies with Part 15 of the
FCC Rules and Canadian RSS-210/RSSGen.
Operation is subject to the following
two conditions: (1) this device may not
cause harmful interference, and (2 ...
Fluid Locations
...
Wear Indicators
The groove where the wear indicator is
located is 1/16 inch (1.6 mm) shallower than
elsewhere on the tire. If the tread has worn so
that the indicator is exposed, replace the tire.
Worn out ti ...