2019 320S kitchen sink leaking at gray tank connection

Burro2113

Water is leaking under trailer when using kit sink. No leaking when shower used. No leaking inside trailer. Appears to be connection from sink drain pipe to gray tank. Estimate 90-90% of water entering tank and rest leaking onto top of gray tank and flowing to ground. Need advice on how to best approach without taking out sink cabinets etc. Anyone experience this and a fix?