Prochem 650 HP heat exchanger question

Hi guys I have a Prochem 650 HP Truckmount machine with 7500 hours on it. There a 3 separate units inside the main heating unit. 2 are high pressure stainless steel heat exchangers and 1 low pressure copper exchanger. The maintenance manual says to get in there and clean off debris every 1,000 hours....

I have never cleaned them and now they have cracked/rusted apart and have water coming out of the exhaust. So I have ordered 3 new heat exchangers and waiting for them to come in.

So...

Prochem 650 HP heat exchanger question