Thank you for your response. I appreciate your help as I navigate these treacherous waters.
The printer is about 3 years old. maybe 4. It shows about 800 prints made. It does sit unused for a few weeks at a time. Temperature and humidity are normal household at about 65-68 degrees and 50-55 (?) relative humidity from a central humidifier on a forced air system.
I am the first to admit my naivete about the printer's maintenance requirements, It's interesting that Epson's user manual mentions nothing about regular maintenance.
You mention the Epson 'repair' manual. Is this their publication number SEIJ08005? I managed to find one on the web. I see that Epson doesn't want us owners to have it.
If this is the correct manual could you tell me which page the damper replacement requirement is on? I have not been able to find it.
I've been reading extensively about the x900 series on the web. It seems there are many many angry owners with this problem. This of course is not your problem and I really appreciate any advice you have from your experience with these printers. It seems to me that Epson has a lot of nerve to sell equipment with hidden maintenance requirements. It has more nerve to continue selling the 900 series if in fact there is an engineering defect.
One last thing, I created an all yellow six inch square in photoshop and printed it on the 7900. Looks perfect. Is this a non scientific test?