well, I do experience this problem, mine was CECHC04 though. The Disc Icon on XMB keeps spinning and then gone, disc not showed up on game menu, but I can hear that the disc inside the drive is still spinning, so I can say that the drive read the disc correctly.
I went formatted my internal HDD and after that, the disc finally showed up on the XMB.
My laser is doing good as of date, not replaced since i brought it.
Model: CECHC04 PAL/EUR 60GB SKU Console
Firmware: REBUG 3.55 CFW [DEBUG MODE, DEBUG XMB, MENU OPTION 2]
BM: Iris Manager v1.2 (Hermes Syscall8)