H470 officejet printer - disassembly (ink cartridges stuck)

My H470 Officejet ink cartridges are stuck on the left side. There's a plastic post (and a couple rubber covered ink sensors?) sticking up from the bottom that block the movement. Normally they must get retracted to allow the cartridges to move. Can't push them down. Tried multiple power recycling to see if it would go through a mode where the post gets retracted while gently pushing down on it. No help.
My printer is out of warrantee.
I need to know how to DISASSEMBLE the unit to try to fix the problem myself from underneath. It's most likely mechanical.
So far I've removed the two screws from the top front and two from the rear bottom. There are a couple plastic snap devices in the right inside front. Releasing those lets me partially lift the top right housing up about 1/4 inch. Seems to be stuck at the rear - maybe more plastic snaps, but I can't get at them. Also, can't lift the top left housing because I can't get to the plastic snaps (if they're there) since the cartridges are in the way.
So I need further disassembly instructions. I'm willing to cut into the plastic housing if necessary to attempt a repair rather than trash it and buy a new printer. I'm pretty competent both mechanically and electrically.
Please help.
Thanks,
Jack
{Personal Information Removed}

It sounds like something has mechanically gone bad in the printer; possibly a gear. Disassembling the printer may not even be able to repair the issue at hand. However, I will let you know that HP does not produce any documentation on the schematics or breakdowns of the hardware of their printers.
Due to the amount of time invest that would be required to attempt such a fix without any ability to know for sure if it will truly fix the issue, I would advise replacing this printer. Have you considered calling HP Tech Support about the upgrade program? The upgrade program is where one can purchase a newer model reconditioned HP printer, with a full factory warranty, at a discounted rate.
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If your problem is solved please click the "Accept as Solution" button ------------V
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Hi , I understand you are seeing an error stating there is an problem with the printer or ink system. If you have completed the solutions presented in the following document I suggest calling us: HP Officejet Printers - 'Problem with Ink System' Error Message Displays on the Computer During Setup. To reach somebody in tech support, what you can do, is use the following link to create yourself a case number, then call and it may help speed up the call process:
Step 1. Open link: www.hp.com/contacthp/
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H470 officejet printer - disassembly (ink cartridges stuck)

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