3715 DT check found A/C 2-2 coolant faul ~~~~~ #3715-A/C 2-2 found low pressure pipe slight freon leak.Tighten and charge freon ok.Before LP=15 & HP=60. After charging LP=40 & HP=110.Check freon leak and monitor freon pressure gauge ok. Done by Haslan/Saini. 7/06/21