Here are the codes as I interpret them, However I am not sure what class Staff Travel would book into, once you have that you should be able to use the below list, 9 mines wide open and 0 means no seats

F - Full Fare First
A - Discounted First
Z - Redemption First

J - Full Fare Business
C - Semi Flex Business
D - Semi Flex Business
R - Semi Flex Business
I - Discounted Business
U - Redemption Business

W - Full Fare Premium Economy
E - Semi Flex Premium Economy
T - Discounted / Sale Premium Economy

Y - Full Fare Economy
B - Semi Flex Economy
H - Semi Flex Economy
K - Semi Flex Economy (Short Haul Prem Eco Feeder too)
M - Semi Flex Economy
L - Discounted Economy
V - Discounted Economy
S - Discounted Economy
N - Discounted Economy (Lowest Class for Avios Upgrade)

Q - Discounted Economy (Lowest Flex and lower Avios and TP)
O - Discounted Economy (Lowest Flex and lower Avios and TP)
G - Discounted Economy (Lowest Flex and lower Avios and TP)
X - Economy Redemption