Per WP13076 we replaced the coil driver for MC1 due to suspicion it was causing MC1 to jump.  The coil driver in question glitched on TOP3.  Referencing D0902810-v12, the chassis in question is U41 on SUS-C4, we exchanged it with a spare.

Old SN - S1001097, New SN - S1100194

Shelia will retest the signal chain to see if this solves the issue.