It has been a while...
How long a "while?"
The forum software was completely replaced on 5 Dec 2018 and most posts older than that were not retrievable through the forum's built-in search function.
Do you still have same same username? If so, a web engine search with limiters can find older posts, which will surely be locked by now. Try this search string that limits the search to a username, year, and Apple Support Communities:
Username +"username”+"2010" site:discussions.apple.com
Replace the "username" that is in quotes with your username but keep the quotes. If you do not need a date search, leave that part out. You can add a subject limiter in the same way the year is added in the example:
Username +"username”+"reset NRVAM"+"2010" site:discussions.apple.com