Dave -- unlikely that there is a legal process to have a recount should the results between the two major groups are close; perhaps 2% or less of the total number of votes.
In the 2015 elections there was no recount when the difference between APNU+AFC and the PPPC was far less that two percent.
In 2015, GECOM refused to undertake a recount of the votes.
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Guyana should follow Canada and allow vote recounting for the May elections
Nov 02, 2015 , Source - https://www.kaieteurnewsonline...r-the-may-elections/
Dear Editor,
Judicial recounts of votes being carried out in Canada has application for Guyana especially that the results of last May elections are disputed (by the PPP and minor parties alleging electoral fraud and demanding a recount that Gecom refused to carry out). Canada held elections on October 19 resulting in a change of government from Conservative to Liberals.
The results in several of the closely fought seats were challenged. The declarations of the winners of those seats were held up as judicial recounts were ordered.
Vishnu Bisram
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From my inside sources, PPPC has won by 51.7% ... app 10,000 votes more than APNU.
I am confident of my sources 
not a big margin,
we can expect recount and other maneuvers by GECOM and its allies.
OAS is urging GECOM to declare the results.