It's a shame that you're not there together with the plumber; that's the way to do these jobs. Oh well.
You need to pull the pump to check the impeller for foreign crud. The first step is to try to spin it by hand; if it feels harder than is should be, some disassembly will be required to clear the pump. This is not always practical in the field.
You are correct in that there are several types of hepatitis. However, there is only one that is transmitted by contact with sewage; that's the one you get the shot for. Your MD can keep all the types straight. Just day "no, Doc, I'm not a junkie, I work with sewage" and he'll know which vaccine to use.
