The [Fares/PSH] Engine does not currently support SU Fare Listings.
Thanks for the response. I am sure I used to be able to access SU fares listing, so this change is unfortunate (although I realise it is outside of KVS' control).
However, you can still access Pricing, Fare Rules & Routing Rules for SU Fares by manually entering the Fare Basis Code.
That is good to know - although unfortunately, I don't know SU's Fare Basis Codes by heart (unlike some other airlines which I regularly use...)