I have a Marshall JVM 205C that is about 2 years old.  It used at home and maybe gets 1 to 2 hours a day use a low volumn.  Today I turned it on and it started making popping noises, not exceptionally loud and then the volume just faded away.  The power light and standby lights remained lit.  I did a little reading and and I thought I should at least check the fuses.  Where are they located?  There’s a little tray that pulls out, holding two fuses (T3.15AF250N), just underneath the Mains Input.  Are these the fuses?  I can not see any electrical connection to these fuses and I thought they might be spares.  If that’s true, where are the functioning fuses?