Marshall Mark 4 Heatsink Fan direction

[henter2017]

Hi all,

I need to change the power transistors on a Mark 4, as they are burned to a crisp, including the TDA7293 modules, the fans on it seems not being doing their job and making them overheat
Whats the best way of instaling some new ones, blowing in or out the heatsink.
By the looks of it probably in? Have them off for a while and cant remember what way they were.

https://ibb.co/ec39Yv
https://ibb.co/gMdyRF

[The Dude]

I can't speak to that amp in particular, but general practice is to blow air out to remove heat from the chassis.