260E: Rear window goes up, but not down

[EricSilver]

1989 260E

When it rains, it pours.

Earlier today I did a post on my broken sunroof angle lift. Now, my left rear window is *half * broken: I can raise it (with scary cracking plastic sounds as it reaches the top) but cannot lower it – unless I use my hand to push it down.

Given a choice between immediately fixing the sunroof or the window, I will opt for the window.

Is my regulator broken, or is the so-called “regulator jaws” that I need -- or is it altogether something else? (If the window goes up, but not down, I would assume something on the downward linkage is broken or detached, but I know nothing of windows.)