The instrument/parts list for Collosus notes that Player V needs a low-E marimba. This is also reflected in the Suggested Setup diagram.
However, it is actually Player VI that needs the low E marimba (see Rehearsal H). The "low E" text in the Instrument/Parts list needs to move from Player V to Player VI. The "Player V" and "Player VI" labels in the Suggested Setup diagram need to swap.