As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TIRE PRESS EICAS. NOSE TIRE #13 WAS 196PSI AT 2000Z. BY 0400Z, PRESSURE HAD DECREASED TO 173PSI. EMERGENCY DECLARED BY ATC FOR GEAR ISSUE. LANDED UNEVENTFULLY, TOWED TO GATE. AFTER LANDING LH NLG TIRE SHOWS 173. REF PDSC, R/R LH NLG TIRE PER AMM. OK TO CONTINUE.