I noticed lately that the oil drip from my primary case is getting less, so I went to remove the inspection cover to check fluid level. First problem, appears to be glued on with silicone sealant and can't get it to move. Would the next option be to remove the complete cover and get at the inspection cover from the backside. Second problem is that the drain plug is non-existant. My thinking there was to drain it and refill with correct amount, the only plug that I can find on that side is on top of the primary chaincase just back from the starter. My HD service manual is no help. Any input would be appreciated.