Shorthand for records in person notes
The notes section for many of my ancestors contains a shorthand for records that I don't completely understand, in lieu of attached sources. They all seem to have been added in 2013.
For example, https://www.familysearch.org/tree/person/details/LCTS-233 contains:
2150499 marr rec, p10 1854 #36
2150506 marr rec ped chrt p25
2150503 death age 81y rec p237#154 1875
2150505 1826 church census p3750 age 30y
What does it mean? How do I find the actual records? Thanks!