  High precision Kepler photometry is used to explore the details of AGB light
curves. Since AGB variability has a typical time scale on order of a year we
discuss at length the removal of long term trends and quarterly changes in
Kepler data. Photometry for a small sample of nine SR AGB stars are examined
using a 30 minute cadence over a period of 45 months. While undergoing long
period variations of many magnitudes, the light curves are shown to be smooth
at the millimagnitude level over much shorter time intervals. No flares or
other rapid events were detected on the sub-day time scale. The shortest AGB
period detected is on the order of 100 days. All the SR variables in our sample
are shown to have multiple modes. This is always the first overtone typically
combined with the fundamental. A second common characteristic of SR variables
is shown to be the simultaneous excitation of multiple closely separated
periods for the same overtone mode. Approximately half the sample had a much
longer variation in the light curve, likely a long secondary period. The light
curves were all well represented by a combination of sinusoids. However, the
properties of the sinusoids are time variable with irregular variations present
at low level. No non-radial pulsations were detected. It is argued that the
long secondary period variation seen in many SR variables is intrinsic to the
star and linked to multiple mode pulsation.
