Wardner repair log

I got this Wardner PCB for a repair from my friend Zoran:

Gameplay was fine except for some minor sprites glitch in form of some sparkling dots:

Studying a bit the hardware, I could figure out where the sprites circuitry lied:

The four EPROMs were dumped good, the six 2148 RAM were fine as well.But when I probe the three 74ALS169 with my BK550 logic comparator I got trouble on pin15 of the ones @B21 an C21:

I desoldered them but they tested fine in all my programmer.I replaced them anyway and this cleared the sprites issue.Job done.