Pioneer VSX-921-K power supply crashed

[maxmat486]

hello everyone,
i've got a pioneer amplifier from the trash.
so i repaired it one time and it worked for one year. (i changed the top258MN AC/DC converter and a diode on the power supply).

but it crashed again, first, the fuse crashed, then, the fuse and the top258MN exactly at the same place . i'm looking for the schematic but i coudn't find it, i searched on
elektrotanya.com/pioneer_vsx-521_821_921-k_sm.pdf/download.html#dl
but i didn't find it ... any idea please ?

[m k]

Are you sure the type is correct?
ifixit has a manual, but it doesn't have a SMPS PCB.

PCB number on left of 2nd pic is not clear, what is it?