Yes, there seems to be some issue measuring, so let's back up. Is the scope partially disassembled so that any of the grounds are disconnected?
So first, let's go back and measure the +260V supply that you fixed earlier, make sure it still has power. DMM neg lead to ground and pos to +260V. Then move just the pos lead to the L801-L802 junction, the same 260 volts or so should be there as it is a direct connection.
Next, power down and look at L801, L802, R838 and R839. You can see how they are connected, L801 and L802 are inductors so they should have a very low DC resistance. If you measure from the L801-802 junction to either TO D1 or TO D2, you should get approximately 15K ohms--and if not, you need to measure each component separately.
Also look at all the connections and wiring to make sure everything is firmly connected and you haven't missed anything.