Testing the accumulators with a tire gauge will cause the pressure to drop noticeably every time you stick the gauge on there due to low volume capacity of the accumulator.
Where did your friend come up with the "30 is the "official" minimum before damage starts." BS?
Low accumulator pressure will not "damage" the transmission, it just won't work correctly (shift smoothly esp.6-7 and 12-13 shifts) until the accumulators are recharged or replaced if failed.
BTW, 135 psi @ 70 degrees F. is the proper charge for the accumulators. There is a pressure/temperature chart that should be used to get the optimal charge when recharging the accumulators. The higher the temperature at recharging the higher the charge pressure required.
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Today's Featured Article - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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