Leaking roof noticed a drip in house where porch was added to house. the addition was done 25 years ago.

You might wanna try these steps:

Move Things Out of the Way. When your roof is leaking, that's bad enough.
Contain the Water. If you have a leaking roof, try to contain it as much as possible.
Relieve Water Pressure.
Tarp the Roof.
Take Photos for Insurance Documentation.
Call a Professional Roofing Company.
Continue Regular Roof Maintenance.

https://www.rencoroofing.com/services/residential/

You need to call a roofer to install some metal flashing pieces. That will create a metal channel for the water to flow down instead of through your roof. Look in the Yellow Pages of your local phone book.