If it is a simple problem it is a good price, I recently fixed my 5342A over the summer break but it took me quite a while to find the problem, some of the ICs are old but can be obtained if it not the main processor, there are good manuals available but if it is a software gremlin a "Signature analyser" is needed, these can be purchased but often go for a few hundred. Fault tracing can be a bit hard as the PCBs (about a dozen of them) are stacked very closely, in the service manual they use card extenders which are unobtanium. Spare PCB cards come up quite frequently. I ended up soldering quite a few wires onto the PCB to bring up the tested points while fired up. Also if you get it be careful to remove the feet before removing/opening the case as the feet hit the main PCB.
Mine ended up being a stuck logic node , I used a saleae on the data lines going to the front panel. Below is a photo of mine pre fixing.