What was found
SJU FLT 803 EN-ROUTE GRU TO CLT. RT ENG OIL QTY DROPPED TO 0, NO OTHER INDICATIONS, OIL PRESS NORMAL. THE POWER WAS REDUCED IN THE RT ENG, BUT THE ENG WAS NOT SHUT DOWN. THE DECISION WAS MADE TO DIVERT TO SJU, THE FLIGHT LANDED WITHOUT FURTHER INCIDENT. MX FOUND D SUMP SUPPLY LINE CHAFED & LEAKING. REPLACED D SUMP SUPPLY LINE & SERVICED ENG WITH OIL. COMPLETED REQUIRED GND RUN, OPERATIONAL LEAK CHECK RII AS REQUIRED.