NE show participant feedback to staff, front M1 & M2 cars aircon were warm and stuffy resulted a stu dent vomited. Train was also jerky. BSD DC was informed to a rrange cleaner to clean up the vomit and arranged for anothe ~~~~~ 3688 - NE show participant feedback to staff, front M1 & M2 cars aircon were warm and stuffy resulted a student vomited. Train was also jerky. BSD DC was informed to arrange cleaner to clean up the vomit .  Found 1688 Aircon 1-2, 2688 2-1 low freon LP:10/30 Vacuum and recharge freon LP:40/HP:110.Check both above location condenser side no sign of leak. Aircon able to cut in/Cut out. Car was cooling. Check 3688 Aircon 1-1 found CCU no compression. Notification CCU change out:2617225 During depot shunting no sign of train jerky and no abnormalities.    Done by Sateesh/Shah/Lingkesh 45486