LB7 FICM Exchange - '01-'04 6.6L Duramax
From FICMrepair.com

If you can't afford down-time and are looking to get your truck back on the road as quickly as possible our LB7 FICM exchange program may be the best option for you.
Fitment: '01-'04 6.6L Duramax
This is an exchange service and it works as follows:
a) Place your order online or by phone; pay for the module and the core fee
b) We'll process your order and send you a replacement module
c) You send your core in we'll process your core refund *** see CORE notes below ***
LB7 FICM CORE NOTE:
In addition to payment for the replacement module, the exchange service price includes an up-front $350 Core deposit. The core amount you are ultimately refunded is contingent upon:
a) 30 DAYS: Your core unit MUST BE RECEIVED WITHIN 30 DAYS FROM THE DATE OF YOUR PURCHASE. If we have not received your core within 30 days your entire deposit forfeited and no refund will be issued.
b) CONDITION OF MODULE: If your core is received within the agreed 30 day term it will be fully tested/inspected. (The inspection and testing process typically takes 3-4 weeks). If the unit is found to be rebuildable/repairable a full core charge refund will be issued. If your core is found to have suffered damage that renders it non-repairable, no core refund will be issued and your module will either be scrapped or return shipped to you. (your choice)
FULLY REBUILDABLE UNIT = Full core deposit refund ($350)
NON-REBUILDABLE UNIT = No Core Refund Issued ($0)
** IMPORTANT: When sending your core in, package the shipment carefully! Cores received with broken or damaged connectors are automatically deemed "NON REBUILDABLE"
If you have any questions at all, feel free to contact us.