So here's the story :
I purchased a AVALON U5 preamplifer/DI at Musicstore about a decade ago for ca. 500 €, and in February 2025 it broke down. I sent them an e-mail so they replied to please send in the unit for repair. They took several weeks to reply with a cost estimate of an outrageous 426 €, because "they had no technical information from the OEM and so they had to replace a significant amount of components to make sure the repair job is durable" !!
Of course I refused and asked them to send me the unit back, but then they claimed 85€ for the cost of estimation & shipment back unrepaired. I had no other choice than to pay to get my unit back, which took another several weeks for them to do !!
Upon receiving the unit, I brought it to a professional workshop nearby and they quickly found the problem's root cause :
1 burned resistor and 2 faulty capacitors.
Parts cost : less than 3€ !!
Labour : less than 1 hour.
This professional workshop recommended me to replace all 24 capacitors in order to make the repair job durable.
Parts cost : ca. 45 €
Labour : less than 2 hours.
So, in the end it cost me LESS THAN 1/4th of Musicstore's claimed repair cost !
When I wrote to Musicstore to claim refund of at least the 85€ for their totally exaggerated cost estimate, at first they ignored my e-mails. Upon my insisting, they arrogantly replied that they did what was necessary and won't accept any blackmail.
This is absolutely outrageous : Musicstore keeping some equipment in hostage for totally unjustified repair costs & cost estimate fees.
BEWARE OF THOSE DISHONEST MUSICSTORE PROFESSIONAL AFTERSALES SCAMMERS !