Slow or standing sink
The grease cap has grown past working volume. Stop sending water down, pour nothing in, lift the lid and look. Grease at the outlet means the device is full; a thin cap with a dead sink means the blockage is past it. Call and say which.
Smell in the dish pit
Settled solids rotting in the bottom produce gas that exits through floor drains and lid seals. Bleach does nothing to the source; enzymes are not permitted and would only move the grease downstream. Run water into dry floor drains, check the lid gasket, then schedule a full pump-out.
Why it is a compliance event
A trap that is backing up a sink passed 25% a while ago — which means the 30-day clock (traps) or 90-day clock (interceptors) was too long for the kitchen, or was not kept. The calculator shows which, and the first visit’s reading sets the real interval.