Customer stated that water was entering the ceiling after rain. They had a roofing company inspect the roof and found entering RTU 2 and flowing down the curb. Tech found drain clear and draining properly. In the pictures shown by the manager, water was coming from the roof and was not entering through the return duct. Tech found unit insulation had been siliconed and found all insulation intact. Tech did find screws missing from the cabinet and installed new screws. Recommended a second opinion from a different roofing company to see if they saw the same issue