Air Venturi Help to disassemble an Avenger

I have 2 Avengers (refurb's) that I bought from Pyramyd about 1 year ago. Both have developed serious air leaks and need work, I have the o-rings, what I need is a video on how to take the gun apart. I can easily remove the gun from the stock but after that, I don't know where to start. I have no idea of where the leak is, and at 82 I've lost about 20% of my hearing.
 
Hi. Many of us have suffered the hardening of O-rings over time. Not knowing which Avenger you have I decided to send you some general information and a Video that may help you on the quest of getting your rifle resealed.
1) https://www.pyramydair.com/model-schematic/m/air-venturi-avenger-regulated-pcp-air-rifle/5136
2)

You may also find other videos that show working on the Avenger by doing a search within Youtube. Also, you can purchase an O-ring kit from PyramidAir but they are the same rather lack-luster O-rings as used with the initial build. I tend to order my O-rings from CaptainOring ( https://www.captainoring.com/store/p298/AVAveng1xBlk.html ) or build my own set by ordering from Oringsandmore ( https://oringsandmore.com ). Good luck.
 
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