[GreenKeys] M28 ASR jammed keyboard

[Duncan Brown]

Just pulled a M28 ASR out of storage that had been working, but now it 
has a  jammed keyboard.  Both the [N] and [LTRS] keys are stuck down. (I 
think the [M] was stuck originally, but it seems OK now) There is no 
[KYBD LOCK]  button on this keyboard. Printer & tape reader run fine. 
(Jingle Bells tape sounds much better on this M28 than on M15!)

What is a typical cause of these keys sticking ? (I thought all those 
ball bearings were supposed to prevent that)

How do I fix it? Not obvious how to get into the keyboard and I image if 
you take the top plate off the keyboard, you will have a heck of a time 
getting all the keys back in!

Looked at Bul 249 & 1169, but they were not much help. Parts manual 
(B1169) does not show how keys sit in keyboard cover.
#573-117-702 gives some disassembly instructions, but no diagrams of 
what they are talking about. (They do reference tho parts manual, but 
not too helpful if you don't know what you are looking for.)

I have pulled a chassis from a M28 KSR before. There was a metal cabinet 
piece across the top of the keyboard that could be removed from inside 
the cabinet to free the keyboard.
This ASR cabinet seems to only have a release/break of the metal strip 
above the keyboard on the right side of the keyboard.  The metal piece 
above the keyboard seems to run to the left, around the perf and be 
solidly connected to the cabinet. Yet this piece must be removed to 
remove the LAK keyboard & base?

Can anyone give me some direction?

Thanks,

Duncan
K2OEQ