To replace the dampers and/or other parts in your printer, you will need to get the Epson repair manual for your specific printer model, which you can find at www.2manuals.com. We have a lot of experience and knowledge about Epson printers, but are not certified technicians, and do not provide instructions or support for printer repair, but help people by providing manual cleaning procedures and helpful maintenance tips we have learned over the years. We have a few replacement printer parts, but you can get just about any part you need from www.compassmicro.com (tell them Dana from Inkjetmall sent you). As we explain on the maintenance page I directed you to, parts in your printer should be regularly cleaned, and replaced every few few years for the best function and longest life from your printer.
About how long are the air bubbles in your ink lines? Did you prime the cartridges exit channels prior to installing, and remove the air vent plugs for proper flow? A few tiny bubbles are typically not an issue, and will pass thru the lines, but if the air pockets are several inches long, you will need to do a few power clean cycles or an initial fill to purge the air.
I hope this helps.
Best regards~ Dana