Yep. Although
that one does appear in the Handbook, running diagonally from port side of the companionway to a split between the salon lights, then stbd of the mast opening. You almost can't miss cutting it if installing a deck hatch behind the mast. There's also a conduit running up the starboard side of the companionway; both it and its port side mate run right through the places you would mount coachroof winches -- where the Handbook diagram claims there is 'pressure-resistant' deck core, but isn't (not on our boat).
I managed to cut both those conduits, too.

It's a gift I have, hitting buried or overhead wires, water lines, etc. Dowsing, for idiots.

Oh well -- we're totally re-thinking the electrical anyhow.
Also discovered the raised spray deflector -- that famous and beautiful curve that starts at the coamings and meets the sea hood/sliding hatch -- is filled with what looks like resin + coarse sand. Might be glass beads; looks like sand. Rough on drill bits, either way.
Peter: Ours was apparently an early Ballad -- we don't have the bronze plate (darn it) telling us what hull number, but the genoa & sailbag bear the number 18, if that means anything. Might be Albin was still figuring things out. The resin 'plugs' for the shroud eyebolts they missed with the drill, 5 times out of 6.
Have you used WEST System's Six10, at all? It's a caulk tube with pre-thickened, low-temp epoxy in it. Just tried some for a door repair last week: amazing stuff, and absurdly convenient for smaller repairs or hardware backing. You can buy the special dispensing tips, or just squirt some on a piece of cardboard & stir.