CHECK OF IDG OIL-FILTER DIFFERENTIAL PRESSUREINDICATOR (DPI)This task describes the procedure for an inspection of the DifferentialPressure Indicator (DPI). Make sure that the red DPI is not extended.You can use a lamp or a mirror for a better inspection. If the red DPI isextended, refer to the Trouble Shooting Manual (TSM). The TSMalternate procedure is used for the reset of the DPI as an alternative tothe replacement of the IDG. A maximum of 3 resets is allowed. If aftera DPI reset the DPI does not extend again between two scheduled oil/filterchanges, the DPI reset status goes back to zero (a maximum of 3 moreresets is allowed).NOTE: 1: At each DPI reset, you must also do the followingmaintenance actions: replacement of both the oil filter and theIDG oil filter.2: If metal particles are found in the IDG oil filter, the IDGmust be replaced.