As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT EXPERIENCED PRESSURIZATION FLUCTUATIONS. PERFORMED GROUND TEST OF ( L) AND (R) AUTO PRESS CONTROLLERS AND CHECKED NORMAL. NO HISTORY ON THIS AUTO PRESS CONTROL SYS. AS PRECAUTION ALSO CHECKED MANUAL OPERATION OF FWD AND AFT OUTFLOW VLVS. CONDUCTED VERIFICATION FLT. NO REPEAT OF PRESSURIZATION FLUCTUATION. UNABLE TO DUPLICATE.