I have a few very tall fir trees and have noticed a pattern of bark missing and sap running. I saw little holes and pushed a small wire into the hole and pulled out what may have been a worm as it was a little squished. My firs are starting to lean as well. Several cedars look fine, thou I have spotted a small amount of sap running on a couple. Pine tree was saved due to my Dad's fight against the pine beetle. I don't think I'll be able to save them.
Outside United States trees and shrubs
Thank you for your question. We are unable to help without knowing where you are, or having photos of the trees and their problems. Perhaps a local horticultural resource would give you some advice. Good luck!