ISRO successfully conducted a rocket test using cryogenic engines in the year 2007. Where is the test-stand used for the purpose, located?

ISRO carried out long-duration ground hot tests of its indigenously developed cryogenic upper stage in 2007 at the Liquid Propulsion Systems Centre (LPSC) test complex located at Mahendragiri in Tamil Nadu. A notable eight-minute (approximately 480 seconds) endurance hot test of the cryogenic stage was conducted on August 4, 2007 at the Mahendragiri facility. Subsequently, the complete cryogenic stage was tested for its full flight duration (720 seconds) later that year as part of the qualification program at the same Mahendragiri test-stand, validating the stage for GSLV use. These reports identify Mahendragiri as the test-stand location for the 2007 cryogenic engine trials.