Does this photo ==>>
show the "transaxle case"? 

     The bolts visible in the left side of the photo appear similar to bolts shown in a drawing of the transaxle case in my Haynes manual.  The sketch in the manual supposedly shows a lower-bolt for draining transaxle fluid, and another upper-bolt for measuring how much fluid is in the case (and also for putting in more fluid, using a syringe).
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