Lumina :: 1995 LS 3.1L - Amber ABS And Red Brake Light Periodically Illuminate

1995 Lumina LS 3.1L w/ ~185K mi

A few weeks back, the amber ABS light would periodically illuminate and then became more frequent until it was On every time I used the car. The light only comes on after driving the car forward ~10-20ft. Recently in the past few days, the red brake light also started coming on at the exact same time as the amber ABS light. I can start up the car and idle, backup, and then as soon as I drive forward 10-20ft., both lights simultaneously illuminate, along with the sound of something that is engaging/closing/switching etc. coming from the front driver's side, maybe where the brake module is located. The sound coincides with the illumination of the lights. There is also absolutely no noticeable difference in braking.

I just changed the oil a couple days ago and the fluid level was good and appears to have not moved at all since I flushed the lines ~2.5yrs. ago. I cannot recall if I returned the pistons to the home position back then, but either way I was able to bleed all 4 lines.

What may be causing both lights to illuminate together when the car moves forward in addition to coinciding with a sort of clunking/engaging noise coming from the front driver's side?

If I have to replace the EBCM, then do I need a scan tool?

I already called Module Master and they do not rebuild any GM EBCMs built before 1999. Looks like Rock Auto has some though.