The servo drive blinked its accusation in crimson: .

“H66,” whispered Miho, his junior technician, peering over his shoulder. She clutched a three-ring binder like a shield. “That’s… the gate driver fault, right? Power module failure?”

Line Seven lurched forward. Bottles spun. Filler heads descended. The tanker’s valve opened with a pneumatic sigh.

“Incorrect,” he said finally. “H66 means ‘Hardware Gate Drive Undervoltage.’ The drive’s brain can’t talk to its muscles. But why?”

The clock was the real enemy. A tanker of preheated fruit pulp was waiting at the blending station. Downstream, a fleet of empty glass bottles sat like an army waiting for orders. Every minute of downtime cost ¥38,000.