yes, it looks like scale to me. Use alchohol/ethanol to remove them with a cotton bud. The shavings i am picking are from the previous owners environment, possible they did some planing of some wood or perhaps a little critter in a tree above where it was growing? definitly not wing moults or exoskeleton moults. I see also that the leaf in question with the shavings is an older leaf. There would have been a larger leaf encompassing the single one left, and sometimes in the cavity between them, debri collects over time. And for the fungal infection, cut the leaf or break it off below the rot, and then dip the wound in cinnamon. Either that, or use Sulphur powder. Then if it keeps comong back, use a strong, water soluble copper oxychloride at half strength for 4 weeks weekly, then increase to 3/4 strength for a further 2 weeks, weekly. Always read the directions though, so you know how much the manufacturer reccomends in regards to half and full strength.
Then after this, use a soluble orchid foliar fertilizer, or a few slow release fertilizer granules (i find the ferts formulated for orchids work best) , and apply weekly again, at half strength for 3 weeks, then every 3 weeks at full strength from then on.