Usually when the accumulator membrane ruptures the fluid fills the void on the "gas side". Seems like the level would drop, not raise. I guess the escaping nitrogen could force the fluid out, but then you would think that the level would really drop. When they fail the accumulators can hold a bunch of fluid......

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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John