First response: stop, isolate, report
A machine that is behaving unusually is stopped rather than persisted with. Continuing to run a scrubber that is leaking, smoking, dragging or losing suction risks damage to the floor, to the machine and to the operator. The unit is switched off, isolated from power, and moved out of any traffic lane, which on a warehouse floor matters more than anywhere else because the next shift will have vehicles moving.
Reporting is immediate rather than at the end of the shift, because the supervisor may be able to arrange something. On a large site with more than one machine, the answer might be as simple as using the other one. The cleaner is not expected to diagnose or repair, and attempting a repair on a powered machine is outside the scope of the role entirely.
