964 Spoiler doesn't retract
 

'89 C4.
Rear spoiler rises at 45 mph as intended. Does not retract automatically. However, it will retract using the toggle switch under the spoiler. Spoiler motors appear to work properly-- no dragging or weird noises.

Is it time for a new module?

Follow-up question. Once repaired, it it possible to wire in a raise/lower switch like in the later models?

Sounds like the module. Read this:
https://rennlist.com/forums/964-forum/682789-reprogramming-the-spoiler.html

^ thanks