LarDasse74 and slacker00, I’m wondering if you still have the RSX shifters you fixed, I have the same problem when shifting from a larger ring to a smaller one (the small lever).
The plastic cover that covers the inside was broken so I pulled it out and there is a small spring that is not doing anything, I assume it is meant to hold the pawl down to stop it slipping up.
I have tried to carefully tension it while trying to get the end of the spring to sit in the groove in the pawl but it doesn’t seem to be long enough. Does it look broken to you? Do you have a photo?
The rear 'brifter' doesn’t have the same plastic cover as the front one, so I can’t look inside to see what it should look like without taking it apart.
I cant email from here atm, so cant ask eeforme to see if I can get some pics of the spring.
Scott.