question to heat exchanger

my heating doesn't do anymore, lt. audio is my heat exchanger tight.

a question, is it possible to get the one free with a tube cleaner again??

or do I break more with it??

Please don't hit me, I'm new.

ed. KVA should cost me the repair 350€ ( find it a little much) and dauret mind. A whole day.

has anyone experienced this?? or can I help??