Solution to delam depends on the cause. If it's water then you have to fix the leak, dry out, replace wood if it's rotted ... and then determine how to re-adhere the delam spot. Can be expensive process.
In my case my small delam spot was due to heat/age and I went down to West Marine to discuss (delam is common in boats) ... I purchased the recommended epoxy (can't remember what it was) - drilled a few small holes,injected the epoxy and covered the area with pressure clamp. I covered the tiny holes with some matching nail polish. Been yrs and the fix is holding up.