Thank you, cashs mom. That pretty well covers removing the case. and has some good info. I do see that the 1400 and some other Kenmores had a doohickey (I'm sure that's what it is called, LOL) on the front base. While it is a little different and possibly broken off like in this picture
There is a 1774 that has what I believe it should look like -
I could not find a free manual for the 1400, but I have one for the 1774. I was hoping there would be something about the doohickey in the manual, but it does not. A couple of thoughts is you want to tilt it back and not up to get to the back of the machine where the hinge pins are. You will need to hold down on the outside part of the base. The two shown above are very thin, so maybe you can hold the base down as you tip it with the ledge that goes around the base. Also I will reiterate that one needs to have some thing on the back of the machine, like a tall pillow, or cut pool noodles to hold the head about as high as the base when the machine is tilted back.
And I'll ask the same as in the thread cashs mom linked to. Are you wanting to remove it from the base to put it in a cabinet or another base? Or just servicing?