How can I troubleshoot an issue with my deck ledger flashing that is causing water damage to my home?

To troubleshoot an issue with your deck ledger flashing causing water damage to your home, start by inspecting the flashing for any gaps, cracks, or damage. Ensure it is properly installed and sealed. Check for any signs of water intrusion or rot on the ledger board and surrounding areas. Consider hiring a professional to assess and repair the flashing if needed.