I have had DOZENS of these codes and it is caused by a bad toner cart or (rarely) the old style DV unit lids. It will cause F2-4x and F2-6x error codes. Usually, replacing the toner cart and recalibrating will work. There have been a few DV units replaced when that failed. Pull the toners out and run SIM 25-1 and check the upper set of numbers. The lower the number, the more toner it has in it. You do not get an F2 code until the reading is below 73. If the number is very low, I do SIM 7, aging, DV check disable. When the machine reboots, the F2 code will not come up. Run a bunch of sky shots to leach out the excess toner, usually 100 - 200 pages gets the reading above 73.
These units also have a drum grounding issue. I had one an hour ago chew its third yellow drum since install. The fusers also have some unresolved issues like residual image and belt damage. This machines firmware is version 7 already. They have not gotten all the bugs worked out yet.

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