Well... I'm not really sure I want to do this because this amp has been a tried and true warrior for me for awhile. I've used this amp extensively and it has never ever let me down. This is the industry standard workhorse amp. I've owned a few of these and have always kept this one because it seemed to be "touched by God" It is without a doubt THE best 400RB I've ever played through. Pretty clean amp cosmetically. There has been a power out added next to the send jack. Very nicely done. It is NOT connected. Other than that all functions of the amp work without issues. No other mods done besides what is mentioned above. There is a slight bit of hum. Does not affect the playability of the amp. I've inspected the power supply caps thinking it might be a bad cap. Visually they all look fine. Bias has been checked and adjusted. Check the pics... if you need any more shots, let me know. SOLD 190.00 shipped. ConUS48 ONLY. Prefer USPS Money Order but can go with Paypal if need be.