Cm2250 egr cooler leak

[sbtrucking]

Need help please,
There was bad exhaust leak in the engine bay last week, made it in town yesterday and my mecanic just caled me and said egr cooler is leaking exhaust fumes, the whole side of the block turned black.
Vin# bm7676
S# 79502636
Freigtliner gaved me part # 4352360nx around $1500 with exchange
Any where I can find cheaper and fast, or are they repairable if its leaking fumes only and no water?
Thanks in advance,
Art