The types of errors are unlikely to be due to poor light levels or reflections etc. It's more indicative of a failure of an active (electronic or optoelectronic) component which points to the exchange equipment and quite likely the pluggable module on the OLT line card which send/receive the optical signal on the particular passive network which serves the OP.
The subsequent explanation suggesting "wear and tear on the connector port at the AGG-node; resolved by cleaning the port." make little to no sense - as that simply doesn't exist in the Openreach FTTP world!!
I suspect somewhere a note has been misquoted/noted or someone is getting jobs confused or is under the influence of mushrooms....
I'm always willing to be enlightened however 😅
Edited by Pheasant (Tue 19-Aug-25 15:39:16)