Lube patch accumulation appears to be function of operating time. Once you've started using it, don't stop. Can't guarantee motor will restart. Flexleads are immersed in the flotation fluid. Extensive corrosion observed on flexleads of all returned gyros.
Residual halides react with copper phase of the flexlead aggregate.
Corrosion continues at slower rate on silver phase. Ultimate failure due to either fracture of embrittled silver lead or complete corrosion of silver. Residual halides an inevitable byproduct of fluid manufacture. Residual chlorides from solder flux and solvent. . Manage gyro operating time as a consumable.