He's contacted the firm to ask them to make good, that I'm sure you'll agree is the right thing to do because it isn't a safety issue or at least one we can see. The falsification on the other hand is worth reporting although if true I'm not sure what can be done about it. If the systems been dosed adequately fine but how do you prove it hasn't been flushed and cleaned, then what? He says yes, we have our doubts but whose to say he hasn't and as the OP said he signed off the Benchmark because of Covid.