Some pictures.
To get inside you need a Torx T9 driver. There are two screws next to the front feet, and two lurking beneath the handle hinges. The back cover comes off leaving everything attached to the front. The PSU is beneath the secondary metal shield - the fixing screws throughout are Torx T9. It's all quite nicely made. I didn't attempt to dismantle any further, and I only had a quick look at the main board. The processor section is very Rigol - an Analog Devices based processor, Hynix RAM and a single NAND flash device, with what look like a couple of FPGAs. However the acquisition section looks more like Agilent - two pairs of chips, presumably a 2GB/s ADC and an acquisition memory controller/trigger device, each with heatsinks. The ADC (?) is a PQFP, the memory controller is a BGA. There is also another Hynix memory chip over here, but I don't think it is fast enough to be the sample memory.
Finally a shot of it all back together and working, also with the dead bits.