Well I just got back from a very unsuccessful vet visit. I have always been very happy with the vets I go to but the vet I saw today didn't really have a clue. She gave them a good poke around and couldn't feel any cysts but said they'd need to have a scan to make sure but that she wasn't good enough with guinea pigs to read the scan effectively. So she's going to talk to a more piggy savvy vet about getting them scanned and get back to me on monday. But she was talking about getting them spayed if they did have cysts or even getting them spayed just in case. I told her as politely as I could that my guinea pigs were not going to have very risky, unnecessary surgery especially when Sherbet is 5. She seemed to think that, like rabbits, guinea pigs should be spayed. So I might be on the look out for a new vet which is going to be hard since I don't have a car.
On the bright side though my girls were very good together in the carry cage going to and from the vets. On a few occasions Sherbbie got scared and burrowed under Rio so that Rios entire body was on top of her. And they're having a little cuddle together on my bed and look very relaxed next to each other. So it seems they only get grumpy with each other when they're in their cage.