help me with my ruined mono amp :(

[pong]

Good day guys.

i bought a ruined class-D 1500wrms from a friend.
i'm trying to revive the amp my self.(don't have the funds to have it repaired )
my problem is that the mosfets of the power supply section were toasted.. i have here couple of questions hope you could help me figure it out..

1st
the original mosfet was P60NF06..Can I substitute IRFZ44 as replacement?
(since P60NF06 is not available here locally)
BUT-one friend told me if i choose to replace P60NF06 with IRFz44 I wont be able to run a 1 ohm load with the amp.IS THIS TRUE???

2nd
2 of the driver transistors (mosfet drivers i guess)had a hole in the middle(burnt).(SMD transistors)one marked M6 and the other one L6..i dont know the equivalent value for this transistors.but I think the M6 is a PNP and L6 is NPN. what can i have as a replacement?

sorry for my ignorance..lolz i'm just starting to learn this hobby.
thanks in advance for any help you can give!
cheers!