As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
F/A REPORTS HAZE IN CABIN AFTER ENGINE START. NO ODOR NOTED. RAN ENGINES AT GATE WITH BLEEDS ON AT VARIOUS TEMP AND FLOW SETTINGS. COULD NOT DUPLICATE DISCREPANCY. PERFORMED OPS TEST OF BLEED AIR SYS IAW AMM TASK 36-11-00-710-801. OPS TEST PASSED. NO HAZE OR UNUSUAL ODOR IN CABIN. NO DEFECTS NOTED. RETURNED TO SERVICE.