You first need to clean your gutters thoroughly.
Rain gutter corner leaking.
Second story gutter corner leaks might not be easy to spot from the ground.
To make sure that you have completely repaired your gutter pour water down your gutter then check if there is water leaking from the crack.
Why gutter corners are troublesome.
Remove the old silicone caulk from the joint connection.
The purpose of all rain gutters is to move water away from the base of your house.
If you have a little standing water try to dam it up away from the corner using a sponge or an old rag.
The bond will not be permanent and the leak will eventually return.
Cut the caulk with a utility knife.
You need to remove the old caulking.
And the seam where they meet is a natural weak point in the system.
If the putty completely solidified water should not be able to go through it.
Pull it off the gutter with your fingers or a pair of needle nose pliers.
You cannot add more caulking to old.
When they fail to do.
Repair leaking joints with silicone caulk.
You re wise to address leaking gutters before disrepair causes costly damage to your home.
One reason is because all corners must consist of at least two pieces of guttering that are affixed together.
You can check yourself.
Also have him check to see if the eavestrough has sufficient slope to allow water to flow quickly toward the downspouts.
If water is leaking where the gutter and downspout jointly connect repair the joint connection.
If you notice that there is still water leaking add putty on the area of the gutter leak.