Don't do pigeon text speak!
Presume you have changed switches and _ucked-up!
how many cores & what colours in each switch? also what colour is in 'common' connection it must be the same in both sw. one will have just one in each C,L1 & L2, other should have 2 in L1 & L2, most often L1 will have 2 reds, L2 will have blk & blue & com. will have Yellow, which will be the same at the other switch,regards SPARX
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