An unexpectedly low bias-current alarm on a transceiver that should be lasing normally can point to a laser driver circuit problem or the laser being improperly shut off, a very different failure mode from the high-bias aging-laser scenario, so the direction of this alarm tells the admin which of two different problems they're dealing with. For example, bias current unexpectedly dropping below a 5 milliamp threshold on a transceiver reporting enabled would point to a laser driver fault rather than normal aging.