The Keychain contains a SecretKeyEntry with assorted encrypted secrets, including the keystore password for files in trustedcerts.
Keystore location: %ProgramData%/Micro Focus/MSS/MSSData/keychain.bcfks
Password location: Either base64 in %ProgramData%/Micro Focus/MSS/MSSData/keychain.pwd, or in the Keychain Utility.
To change the password for the keychain: Administrative Console > Configure Settings – General Security > Keychain