The project underscored that authorities are in no hurry to respond to calls for the communist icon's remains to be buried, a debate that began with the fall of communism in 1991.
The Lenin Mausoleum opened yesterday, a boxy structure standing just outside the Kremlin walls on Red Square, had not seen any major works for 80 years, according to the Kremlin's secret service FSO, which is responsible for the building.
The work was ordered because the tomb's foundation was starting to tilt and became water-damaged.
Debates on whether to remove the body permanently from the mausoleum constructed in 1924, when Lenin died at age 53, started after the collapse of the Soviet Union in 1991.
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Though the mausoleum remains a tourist attraction, increasing numbers of Russians are calling for Lenin to be buried. Russia's Communist party vehemently opposes the idea.
In the latest big debate on the issue last year, the ruling party United Russia launched a campaign for Lenin's burial, but the discussion was quickly shelved.
President Vladimir Putin said in December, before the repair work began, that the body reflects Russian tradition, even controversially comparing it to the ancient Orthodox relics of saints displayed in famous monasteries in Russia, Ukraine, and Greece.
"The Communists have taken on the tradition," he said at the time. "They did this with knowledge and considering the needs of their time.