6 yr old weeping cherry is so admired for doing and growing well this spring. Its at least 11 ft tall,trunk at least 6"inches in diameter. Just 2 weeks ago notice some brown leaves on a few branches (grouped on one side)branches are still plyable,but all brown leaves on those branches. Bleeding from main trunk a sap-like substance,thick and amber in color. Is there anything my husband and I can do to help ? We watered since a 2 week dry spell thinking that would help.Northeast Pennsylvania region.