Hey Charles, Have a 504 but have never been into this. Just got thru replacing O rings on the D & P control shafts on a 666, almost the same. Looking at the 504 parts book the drain plug is supposed to be in the left front corner of the housing. Yours appears to have already been removed. I don't see it in the pics. Check in that corner for a hole approx 1/2 in. dia. Don't see the standpipe either. 656 and 666 have them though.
As for the leaks, with all due respect to Allan, tear it down and fix it RIGHT. It's not hard to do but it is tedious and time consuming, lots of small parts.
You will need seal #37 in parts book CIH PN 383133R91 O ring #81 in parts book CIH PN 355967R1
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