My Porter-Cable 250 B has stopped and I need help with next step. 

It is probably 30 years old but has been used rather infrequently in last 10 years or so.  It has always been oiled every time it was used.  I was using 2 inch nails and I had about 10-15 nails in the carriage and i added a new sleeve.  Both set of nails were the same P-C 15 gauge finish nails.  The gun jammed at the point between the 2 sections of nails.  I pulled out the jammed nail, but the gun will not fire.  No air is being released and no air leaks.  I am not sure what to take apart and have a spring pop out. 

Any help would be appreciated.

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