Age and vibration, it is attached to the motor which rocks on its mount when compared to the oil fill cap which is mounted on the firewall. Also a failing AOS causes low vacuum that collapses the tube when off throttle.
In regards to the RMS, I use the sheet metal screw method to remove them.
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1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster original owner. I installed used motor at 89k.
1987 924S. 2002 996TT. PST-2
Owned and repaired Porsches since 1974. Porsche: It's not driving, it's therapy.
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