Repair Reliability?

Reading a recent repair-or-replace question here got me thinking. EVERY time a dealer or specialized repair shop OK'd a repair complete, it was not once actually repaired the first time. Examples:

1. Bought a new power amp at an authorized dealer; took it home and it immediately blew a speaker. Dealer checked the amp, said it was OK. Took the amp home and it immediately blew another speaker. Real solution: dealer replaced the faulty amp with their floor model.

2. Got new CD player from a different authorized dealer; After a while the player stalled at the same spots on a handful of CD's. Notated the spots and delivered the CD's and player to the dealer. Dealer charged for alignment and lube, said all OK. Got the player home and it immediately stalled where indicated. Dealer tried again, again insisted it was fixed, but again no change. Real solution: sent to factory for actual repair.

3. Got a new cassette deck at an authorized dealer. Fifteen years later when it broke down the factory was out of business. Shipped it to a brand specialized repair place to get it working. Paid bill, deck shipped back with the same problem immediately evident. Real solution: the specialized shop found the problem after shipping it in the second time.

So many coincidences, there appears something diabolical at play here. Have you experienced any unfinished "tested and checked all OK" repair efforts?