As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMBOUT, F/A REPORTED SMOKE IN THE CABIN PULLED UP ECS PAGE AND RT PACK WAS SHOWING 120 IN AUTO MODE. AUTO MODE WOULD NOT CONTROL TEMP SO SWITCHED TO MANUEL MODE. DECREASED TEMP AND SMOKE CLEARED. ACFT RETURNED TO DEPARTURE. R & R NR 2 ACM IAW AMM 21-51-10. AFDL NR FA196521 FOR OPS CHECK. ACM SERVICED IAW AMM 12-13-21. AIPC - 21-51-00. FIG. 10, 45C.