Here's what the rules have to say about marking your Equipment. From the "Design, Program, Build" page:
In the past I've typically interpreted this as not allowing stickers and, at least, discouraging visible markings.
You might be able to coach your team to brainstorm about ways to improve the issue. They might come up with a team way to take notes about how their robot is constructed, and even a clever way to remember which cable goes where.
I'll let coaches talk about their experience and recommendations.
Steve Scherr
Virginia-DC FLL Referee Advisor