I assume the point of water infiltration has not been pinpointed
Could start by running a hose across the lowest row of shingles, slowly, from one end to the other. look for any water leaks on the interior. Repeat on the second row of shingles, then the third and so on until the leak is located. The fix will be dictated by the location of the leak
I notice missing 3-tab shingles in two locations, a plumbing vent penetration whose boot has been either covered of replaced with a large amount of Vulkem or sealant. Note the EPDM used to manufacture the boots deteriorates in the presence of hydrocarbon based sealants. Flashing around the condenser and skylights as well as the woven valley would also be prime suspects for leaks.
A truly hack fix can be affected by using adhesive backed ice/water shield tucked under a row of good shingles above the leak and adhered over the leak. The ice/water shield is not UV resistant and will break down over months, but I used this technique to stem leaks in areas of my roof giving me time to tear-off, re-flash and re-roof section by section.
Could start by running a hose across the lowest row of shingles, slowly, from one end to the other. look for any water leaks on the interior. Repeat on the second row of shingles, then the third and so on until the leak is located. The fix will be dictated by the location of the leak
I notice missing 3-tab shingles in two locations, a plumbing vent penetration whose boot has been either covered of replaced with a large amount of Vulkem or sealant. Note the EPDM used to manufacture the boots deteriorates in the presence of hydrocarbon based sealants. Flashing around the condenser and skylights as well as the woven valley would also be prime suspects for leaks.
A truly hack fix can be affected by using adhesive backed ice/water shield tucked under a row of good shingles above the leak and adhered over the leak. The ice/water shield is not UV resistant and will break down over months, but I used this technique to stem leaks in areas of my roof giving me time to tear-off, re-flash and re-roof section by section.