Since you have them off the bike I suggest carefully removing the hoods, don't want to hurt them since these are hard to get these days.
The locations of the pawls on these shifters are: 1. Near the location where the B (smaller) lever enters the body. This is behind the A(main/brake) lever above the screw that is in the A lever. 2. At the top of the mechanism between the cable installation hole and the cable exit hole. These pawls are the ones that usually causes problems.
Good luck.