Giscours malfunction

[Pronan]

Hi Guys,
woke up this morning and only had music on left channel. checked cc80's and swapped cables around it appears to definitely be the pre-amp.

all six valves are glowing and i have a green light infront of each WE tube.

see pics for evidence. Anyone have any ideas or experience or further diagnostic thoughts or is it back to the factory.

Giscours purchased second had from AA member, been working fine for nearly a year, serial number 003 and after email with shindo san (upon purchase) no service was recommended.

Only change to the set up was the swapping in of some different kt88's in the cc80 (two months ago). Had not got round to biasing the amps, could that affect the pre-amp????

thanks in advance for any help,
Paul.